"No, no, hell naw" - Beyonce. I used to be the type of person that would say I wish a motherfucker would cheat on me I would leave so fast. But every promise don't work out that way. Even when someone hurts you it can be hard to just leave.
Pretty much every cheater who has ever been found out has been sorry. But the question is whether they are truly sorry about cheating or just sorry about being caught. If you have been with your partner long enough, you may feel that you know when they are being sincere. If not, there are a few things to look for.