I think I’ll chime in here because I have some personal experience with this. I have people very close to me in the same situation as your friend. It made feel very torn to see that people who were very near and dear to me and inherently good people do what my ex did to me. Slightly different of course, but it was really difficult for me to reconcileZ Those people who are near and dear to me still are. I separated our relationship from that of their marital problems and decisions. It wasn’t and hasn’t been easy though. Your friend could be an amazing person to you and friends around her, and still do something immoral to someone else. Some people can separate that and some can’t