Hello!
I didn't leave after ex husband's first affair came to light. It came to light many years after it happened and when it had happened his mental health was in a bad place. I was pregnant with eldest when affair happened and pregnant with youngest when I found out. I was terrified of doing birth and newborn alone so I agreed to "trying" to make it work.
I don't think it ever worked. He wasn't really sorry except perhaps for getting caught. I never trusted him again. I couldn't bear his sexual advances.
We struggled on for 3 years. He had over 50 affairs as it turned out. He will tell you all about how that's all my fault because I was a terrible wife and didn't have sex enough because (and he genuinely believes this...) all married couples have sex 2-3 times per week and I didn't. So what else could he do except have affairs and swing at group sex parties with men and women whilst I was the sole earner in our house.
Honestly? I was too scared to leave. I should have done. In the intervening 3 years my house value shot up and I now have to pay him £100,000 in the divorce.
I so regret trying to make it work.
My advice is this.. ask yourself why are you considering staying.. and if the answer is anything other than because I love him and believe he is committed to our relationship then you should leave. It's hard. But it's so much harder to live miserably with no trust.
Good luck whatever you decide. I have stayed and I have left in the end. Feel free to message me if you want to talk to someone who gets it.