My best friend for almost 10 years met this man on a dating app. There supposedly friends but a few…

My best friend for almost 10 years met this man on a dating app. There supposedly friends but a few years ago when the man was going marry his children's mother. Come to find out my best friend knew about it and still had sex with him. Fast forward to now she has her daughter calling this man daddy and everything. I told her what she was doing is wrong. She got mad and said if I want her to call him daddy than so be it. But she forgot she's a home wrecker and she gets mad because I don't like him. They suppose to be in a relationship now and he still cheats with other women online.