I’m sure each case is individual. It happened to me only a couple of years into our now 35-yr marriage. I weighed all the options. Asked those questions. Did I think it was a one-time thing? Was he sorry? Of course I was mad, hurt. Without divulging all the sordid details, yes he was. I talked to my mother, my resident expert. Took her advice and decided to forgive him, move on, save the marriage and, in my case, things worked out for the best. He treats me good and we have a strong marriage.
Funny thing is, he hurt me without a second thought, because he was impaired of course, but I couldn’t bear to hurt him back. What sense does that make? We had kids, what would I do? There was much to consider.
Later in life, there was an admission from me that I had a brief, meaningless trist I never told him about (kissing was as far as it went) and he lost his mind over it. Eventually, we got over it, but funny how he was when the tables were turned. A marriage takes a ton of work, people are human and make mistakes. It’s all in how you deal with them and if you truly love your partner enough to fight for them and make it work, instead of rushing into a devastating situation for everyone, just because you are emotional at the time. My two cents anyway. 😊