It’s very sad. I’m not even a person who doesn’t advocate divorce. In fact I’m helping my friend plan one now. He and is wife hate each other with a passion. Now if he were to tell me they were best friends but something was missing I would point him in another direction. I’m not saying at all that you should drop her as a friend my point is only she is not an amazing person. An amazing person would say “I can’t put my bf and my kids through this pain so let’s find a way to work this out”. Then she could always revisit when the kids are older.

The bottom line is your friends H shouldn’t want to be with a woman like this and maybe this is something you can help him see moving forward.