I Am The Other Woman

I know a MM well who slept with another woman, after which he ended his marriage and now the other woman and him have been married for years. He said if it wasn't her it would have been someone else because he was miserable and had checked out from the marriage over the course of years. He did it out of anger, pain, feeling unloved, and now looking back he says he for sure did it wrong, he should have left his wife then moved on but he has accepted his past and learned from it. So the point of this is that his story taught me two things:
1. If a guy wants to cheat/leave it is not the woman being there that makes him do it, as he will just go to the next woman that comes along.
2. The saying once a cheater always a cheater is not true for every human being in the world.