This guide is psychoeducational content. It does not replace couple therapy or individual support. If the discovery of infidelity comes with violence or threats, or if you are afraid of how your partner will react, your safety comes first: read our programme Coercive control: recognising it and getting free, and contact a specialist helpline in your country or, in immediate danger, the emergency services. If you are thinking about dying or harming yourself, call your doctor the same day. Allow forty minutes to read.
1. Before you begin
You have discovered that your partner was having an affair. A message on a phone, a confession in the middle of the night, a bank statement, a friend who finally spoke up. Since then you have not been sleeping, you keep seeing scenes you never saw, and within an hour you swing from rage to wanting to hold the person who betrayed you.
Or you are the one who had this relationship. It has been discovered, or you confessed. You can see the pain you have caused, you do not know what to say, and every conversation seems to turn into a trial.
Three things, straight away.
What you are going through is an expected reaction to a shock. Thoughts that go round and round, images that force their way in, checking, insomnia, emotions that change from one minute to the next: in the betrayed partner, these reactions resemble those that follow a traumatic event. They are intense, and they ease with time and with what you do.
Many couples recover from infidelity, and some come out of it with a more honest relationship than before. Others separate, and a separation handled well is also an outcome. Neither is a failure in itself.
You do not have to decide now. Decisions taken in the first days are often taken by the pain. Unless there is danger, giving yourself a few weeks, even a few months, before deciding is almost always better.
Who this guide is for
For the person who discovered the infidelity, or to whom it was confessed.
For the person who was unfaithful, whether they want to repair the relationship or do not yet know what they want.
For both, if they read it together. Some sections are addressed to one or the other; reading the ones meant for the other partner too helps you understand what they are going through.
It applies whatever the sex and orientation of the partners, whether the couple is married or not, and whether the infidelity was sexual, emotional or online.
What this guide is not
It is not a plea to save the couple at all costs. Nor is it a court: it will not say who is right. It will help you get through the crisis, understand, and decide with full knowledge.
It does not apply as it stands if there is violence or coercive control in the couple. In that case the question is no longer rebuilding trust, but ensuring your safety.
How it is organised
Part I — Understanding (sections 2 to 4). What counts as infidelity, what the betrayed partner goes through, what the unfaithful partner goes through.
Part II — Getting through the crisis (sections 5 to 8). The first weeks, the questions, the triggers, transparency.
Part III — Making sense (sections 9 and 10). Understanding what happened, and what forgiveness is.
Part IV — Deciding (sections 11 to 14). Rebuilding or separating, and how to do either.
Part V — Going further (sections 15 to 19). Particular situations, when to seek help, frequently asked questions, key points and sources.
2. What counts as infidelity
There is no single definition
For some couples a kiss is a betrayal; for others it is sex; for others still it is months of intimate messages with someone else, without ever meeting. What defines infidelity is not a specific act, but the breaking of an agreement — explicit or implicit — about what is reserved for the couple.
That is why two partners may disagree about whether there was infidelity at all. "Nothing physical happened" may be true, and the betrayed partner may still, rightly, feel betrayed.
The emotional affair
The psychologist Shirley Glass described how a friendship slides into an emotional affair. Three elements recur: secrecy — hiding the nature or intensity of the exchanges —, emotional intimacy — confiding in the other person what you no longer tell your partner —, and attraction, acknowledged or not. She summed up this shift with an image: in a solid couple there is an open window between the partners and a protective wall facing others; in an affair, the wall goes up between the partners and the window opens towards the third person.
What is known about how common it is
Large surveys show that infidelity is neither exceptional nor universal: a substantial minority of people in relationships report, over their lifetime, a sexual relationship outside their couple. Figures vary by country, by generation, and above all by how the question is asked. What matters: if this happens to you, you are not a special case, and neither is your couple.
Common misconceptions
"Infidelity proves the relationship was in trouble." Not always. Studies of the factors associated with infidelity find causes linked to the couple — distance, avoided conflicts, dissatisfaction — but also individual causes and circumstances. Some unfaithful people describe themselves as satisfied with their relationship.
"After infidelity, it's bound to be over." No. Some couples go through this crisis and stay together, with a relationship that can become satisfying again.
"Once a cheater, always a cheater." One follow-up study found that people who had been unfaithful in a previous relationship were more often unfaithful in the next one. That is a higher risk, not a destiny: what counts is what the person understands and changes.
"If I had been good enough, this would not have happened." The unfaithful partner made a choice. Both partners may have contributed to the state of the relationship; only the unfaithful partner is responsible for the affair.
Frequently asked questions
Do I need to know everything to be able to move forward?
You need to know what allows you to understand and decide: the facts, the duration, the nature of the relationship, whether it is over, the risks to your health. Intimate details are rarely necessary, and often harmful. Ask yourself the question before asking for them.
Should I meet or contact the third person?
It is rarely useful, and often painful. People expect answers, apologies or a kind of victory from it, and come away with more images. If you feel a very strong need to, talk to a therapist first.
My partner says it was "only" emotional. Do I have the right to feel betrayed?
Yes. Secrecy, intimacy shared elsewhere and lies are enough to amount to betrayal. For some people an emotional affair is even more painful than a one-off sexual encounter.
How long does it take to recover?
There is no fixed duration. Rebuilding is measured in months, often more than a year. Good days become more frequent, triggers less violent. If nothing shifts after several months despite efforts, professional help is needed.
I can't stop checking their phone. Am I going mad?
No. It is a very common reaction. But beyond the first weeks, checking maintains the anxiety instead of calming it. Agree together on time-limited transparency, and reduce gradually.
Should we tell our children?
Children need to be reassured, not to know the cause of the crisis. They do not need to know there was infidelity, and must never be drawn in as witnesses. If a teenager has found out, acknowledge what they know without putting them in the middle.
I was unfaithful, and my partner brings it up in every argument, a year later. What can I do?
It may mean that the wound has not been sufficiently acknowledged, that understanding of what happened has not taken place, or that other problems in the couple are being expressed through it. Rather than replying "you're going to go on about this for the rest of your life", suggest talking about it outside an argument, and consider couple therapy if the deadlock persists.
Is staying a lack of dignity?
No. Staying after infidelity can be a considered and courageous choice, just as leaving can be. Dignity lies in the decision being yours, made with full knowledge, and not dictated by fear, pressure from others or exhaustion.