According to Susie Masterson, a BACP-registered relationship coach: âForgiveness is really tricky because it requires us to go back to the point of the pain. You have to accept that itâs a process and that it doesnât have to happen overnight, it doesnât have to be black and white, and you can learn to forgive in a way that separates the behaviour, once you understand it, from the person.â
If that sounds like a big ask to you then you are not alone. Jess*, 48, says: âWe were already on the path to splitting up when my then husband decided to confess that he had a year-long affair 10 years earlier, only two years into our relationship. I was devastated and have never felt so angry in my life. I behaved completely out of character and threw a glass of wine in his face. I refused to ask for any details. At that point I just didnât want to know. I think mainly I was angry about all the lies Iâd been told both at the time and then because he had been keeping it to himself over all those years. We split up soon afterwards.â
When it comes to anger, Campbell says itâs important to understand that sometimes anger stands in for grief â people feel anger instead because they feel so vulnerable.âAnger is easier. But the problem is, if you are in a relationship where youâre trying to stick together, anger tends to end it because thereâs no way around it. Some people cannot let go of it.â
She adds: âYou must not think, Iâm never going to let you forget you did this. I mean, you might not be able to forgive, but if youâre going to just keep going on and on and on about whatâs been done to you, youâll kill the relationship.â

Why did they cheat?
âThe most common thing that people say in therapy sessions is âI donât know why I did it. I donât know what came over me,ââ says Campbell. Rather than asking âwhyâ, she explains that as the therapist she would ask the guilty party âwhat did you get out of it?â in order to determine what was missing from the marriage.
Masterson adds another demand to this already uncomfortable issue. âWhether we felt at the time that we were aggrieved or not, what we need to accept is that this relationship wasnât working right,â she insists. âIf we donât accept that there was a rupture or it was broken, how can we possibly repair it?â
Accepting this is possibly easier said than done. But the consensus is that after all the apologies, if you do want to try and stay together there definitely needs to be an understanding of what caused the affair in the first place.
First, of course, it can be because of the inevitable demise of the honeymoon period. Campbell explains that when we are in the early stages of relationships we are full of hormones, some of which are so strong they can disguise any negative feelings, adding, âwe donât talk to people about the disappointment when the honeymoon period wears offâ.
Surprisingly, she says, this isnât the sole preserve of newish relationships but can be deferred for many years.
âWhat people do is distract themselves with planning the wedding, having babies, throwing themselves into work, and then when the children leave, another crisis point, they think, âOh, I still feel disappointedâ, and thatâs when they start looking around for someone else.â
Another extremely common trigger for affairs is being unsettled by an increased commitment. Campbell says: âWhen you talk to partners, whether theyâre having problems with their sex life, or whether itâs an affair, there was very often some kind of increased commitment just before it happened â getting pregnant, moving in together, getting married, even increasing their mortgage or moving to a bigger house.â
And for others, the spur is fear of intimacy. âSome people get to a point in their relationship where they feel really close and intimate,â says Campbell. âIt scares them that theyâll lose that person, so they distract themselves with another relationship.â
One thing that is âincredibly commonâ for a one-off affair, says Campbell, is a man who is highly stressed but cannot talk to his wife about it. âMen have this feeling that they should be able to manage things and not have to confide in partners â they need to protect their partner.â Instead what can happen is that he confides in someone else, often at work, and that this leads to an affair they werenât originally looking for. âItâs very clear whatâs wrong with that relationship: they need to be able to confide in their partner, and their partner needs to be able to welcome those confidences and be supportive.â
Finally, Campbell says that sometimes infidelity is simply an âexit affairâ. She explains: âPeople think that the relationship is over, and so if I do this thing, it will upset my partner enough that theyâll throw me out.â

Did my partner have an affair because our sex life was dwindling?
There is much discussion about how an affair isnât just about sex, although this seems to be pretty much the defining factor. But Campbell says itâs complicated. âImportant research has shown that, to men, the emotional connection is more important than the sexual connection. What can sometimes happen, if the emotional connection isnât there, is that [a man] will go out and meet someone, and [heâll] suddenly be surprised by the strength of [his] feelings, because [heâs] been pushing those feelings down for years and years.â
And of course, thereâs an imbalance between new sex and old sex. Campbell explains: âI think itâs important for couples to know that in long relationships, itâs more common for âresponsive desireâ [as opposed to âspontaneous desireâ] to kick in. At about 10 years into a relationship, many men and most women donât feel desire until theyâre actually aroused [either physically or, for example, by erotic content]. That can seem like lots of loss of libido. Also, when women hit the menopause, they donât have that spike in desire at the middle of the month when they ovulate, and so they think theyâve lost their desire, but they havenât.â

How do I know my partner wonât keep doing this?
Short answer: You canât ever be sure. But there is a personality type for someone who has serial liaisons as opposed to a one-off affair. Campbell says it can be about power. âItâs often quite narcissistic â people who donât feel that theyâll get their needs met unless they manoeuvre for them. Maybe their needs werenât met in childhood, and so they think you have to trick people to get your needs met.â
It comes back to self-esteem. âThey donât feel good enough. I mean, they may not know they donât feel good enough. They may think theyâre great. But they need to keep having that reconfirmed, and thatâs usually why they keep having the affairs.â
So can there ever be any hope for a serial adulterer? Campbell says: âWell, there is hope if they donât want to be serial adulterers â but most of them do.â

I had an affair, should I tell my partner everything?
Campbell says: âI would never, ever advise somebody to [blurt it out] because you have responsibility for what youâve done. I mean, the idea that you should confess everything is a bit daft, because how does it help if you maybe snogged somebody at the office party? You were drunk, you wouldnât do it again. It was a moment. And why do you need to tell your partner? It could induce a crisis that isnât necessary.â
But if it is serious enough to come out, avoid raking over it endlessly. Masterson says: âI call it doing a forensic accounting of an affair, to understand every minute detail, which is just our defence mechanisms going into overdrive because we are out of control, because weâve had this bombshell, and weâre seeking to make sense of it by controlling every aspect of it.â However tempting, this is not a good idea. Instead, you guessed it, itâs time to light up the halo and try to understand the other person and why they did what they did.
How do we move on?
âQuite often what happens after an affair, there is a lot of sex and a lot of talking, and people do feel very close,â observes Campbell, âand then suddenly, after a few weeks of that, the wronged partner thinks theyâre exposing themselves to the possibility of this happening again, panics and doesnât want any sex or any closeness, in case theyâre putting themselves at risk.â
This is natural but unhelpful. âYou cannot future-proof your relationship. Itâs impossible because you donât know whatâs going to happen. You have to accept uncertainty and accept that you have to stay on the ball.â
That doesnât mean spying on the person to make sure they donât do it again, but making an effort (time for that halo again). âRelationships are very, very hard, and most of us donât make the effort that relationships need. This is because weâre sold the lie that relationships are romantic and if you love somebody it will be fine, and you donât need to make any effort. That is rubbish.â
Masterson advises: âI think date nights and time together is really important. Scheduling intimacy is really important as well. And I think actually opening up a whole conversation about intimacy can be really important because there are a lot of assumptions about sex and intimacy and how we show love in relationships that get brought into sharp focus when someone has been unfaithful. But actually itâs a real opportunity for you to have a conversation about what turns you on and what doesnât turn you on.â

Can we go back to how it was before?
âIf infidelity has happened but you want to stay together you have to see it as an opportunity for growth. It can really change your relationship. It could be a wonderful thing â or it could be a disaster. You know, you donât know until you check it out,â says Campbell. She says relationship guru Esther Perel puts it like this: âWould you like a second marriage? Because your first marriage is over. The way that was has ended.â
Masterson adds: âThe bedrock of every relationship is rupture and repair, because every relationship goes through a rupture, and what Iâm really invested in is how to help people repair, whatever the transgression is.â
And Campbell reveals: âPeople say things to therapists, like we just want to go back to the way it was before. Absolutely not. No, you donât, because the way it was before was what led to this. What do you want? What needs to be different? So I try to engender in my clients a sense of excitement about the future.â

Should we make new rules in the relationship?
Yes. Masterson advises setting parameters and conditions, which people often donât do right at the beginning of a relationship. âSo it could be really important to say, âIf this happens I need to tell you what my position is going to be.â Thatâs having agency, and that can be really strengthening.â
Another strategy she recommends is regular relationship audits, with couples scheduling time to check in on the relationship, to have a conversation about whatâs going on for each other, and to make space to do that. That is different to and as well as scheduled intimacy (meaning sex or physical closeness) which also key.
Overall, says Masterson: âWe have to start to be a lot more contrived to rebuild a relationship, and it will be weird at first, but often, when I set homework for my couples, they tell me that weeks into it, they forgot about the origin of it. They just know that that thing has improved their relationshipâ
She concludes: âThereâs always blame on both sides. Thereâs fault on both sides. Thereâs agency on both sides. Thereâs things that could be improved on both sides. It doesnât really matter about the language. Itâs about how do we make it work for both of us?â
*Name has been changed