You resolve to leave at midnight and resolve to stay by morning. Here is how to make this call on evidence you can actually see, instead of on the swing of a single day.
At night you are certain you have to leave. By morning you are certain you can make it work. By afternoon you do not know anything except that you are exhausted from deciding the same thing over and over and never making it stick. If that is you, the problem may not be that the answer is hard to find. The problem may be that you keep trying to find it on your worst day, when you are least able to see straight.
There is no universal rule here, and anyone who gives you one is selling something. But there is a better way to approach the question, and it starts with refusing to decide in the middle of the storm.
The decision keeps flipping because the inputs keep flipping. After betrayal your feelings swing hard and fast, from hope to despair and back, sometimes inside an hour. If you make the call whenever the feeling peaks, you will make a different call every time, because you are not deciding about the relationship, you are reporting the weather. A choice this large cannot be built on a number that changes by the hour.
So the first move is not to answer faster. It is to stop letting any single day cast the deciding vote.
"Do I feel like staying right now" is the wrong question, because the answer is just your most recent mood. The better question is: "over the last weeks, is this relationship trending toward something I could live inside, or away from it?" That reframes the decision from a feeling into a direction, and a direction is something you can actually read.
The research and the clinicians who do this work point at a fairly consistent set of signs. Staying tends to work when the partner who strayed takes full accountability without minimizing or blaming, shows remorse for the harm done rather than just regret at being caught, has genuinely ended the affair and all contact, becomes transparent rather than defensive, and is willing to do the long work. Couples with those conditions, and especially those who get honest help, recover at meaningfully higher rates. Most couples who face infidelity do, in fact, stay together, and a large share of those who seek therapy rebuild successfully.
None of that guarantees your outcome. But it tells you what to watch for, and it tells you that the question is less "do I love them" and more "are the conditions for repair actually present."
The same sources are just as clear about when to go. Leaving tends to be the healthier path when the affair continues or contact is not truly cut, when your partner denies, minimizes, or blames you for their choice, when this is part of a repeating pattern of betrayal and broken promises, and always when you are made less safe. If the conditions for repair are simply not there, staying does not produce healing, it produces a slow second wound. Choosing to leave in that case is not a failure to try. It is reading the evidence and respecting it.
Here is the practical heart of it. Instead of interrogating your feelings on the bad nights, keep a quiet daily record of how safe, how trusting, and how connected you actually feel, and let it run for a stretch of weeks. Then read the line. A line that is slowly climbing, even with bad days scattered through it, is telling you the conditions for repair may be real. A line that keeps sinking no matter what is promised is telling you something the hopeful mornings keep talking you out of. The trend is the closest thing you have to an honest advisor, because it cannot be swayed by the last good conversation or the last terrible one. Here is how that works.
No article, therapist, or statistic can or should make this decision for you, and you do not owe anyone a particular answer, not the one who wants you to stay and not the one who thinks you should go. What you owe yourself is a decision made on the clearest evidence you can gather, on a steady day rather than a shattered one, honoring your own values and safety rather than fear, guilt, or pressure. Gather the evidence. Watch the direction. Decide when you can see.
Should I stay after infidelity?
There is no universal answer. Staying tends to work when there is full accountability, real remorse, a genuinely ended affair, transparency, and willingness to do the work. The clearest way to decide is to watch the trend over weeks rather than deciding on your worst day.
When should I walk away after infidelity?
When the affair continues or contact is not truly cut, when your partner denies, minimizes, or blames you, when it is part of a repeating pattern, and always when you are made less safe. If the conditions for repair are absent, staying tends to deepen the wound.
Why do I keep changing my mind about staying or leaving?
Because you are deciding on feelings that swing hard after betrayal. A decision this big cannot rest on a mood that changes hourly. Tracking the real direction over weeks gives you a steadier basis than any single day.
Does staying after an affair usually work?
Most couples who experience infidelity stay together, and those who get honest help recover at higher rates, but long-term success depends heavily on disclosure, accountability, and sustained effort rather than on staying alone.