Cheating bbf hubby

So I’m having my best friend over for the night because she is upset

The thing is she has recently came back with her stupid boyfriend, yes I don’t like him, they were on and off for 2 years and then she found out that when they were separated he had a very serious relationship. Anyway the thing is they were back together and she found out he was still in contact with the girl. Not together but in contact after they back she started complaining to him about not been affectionate but she was just jealous because she read some old text on his phone from previous relationship. They had a fight October 2018 and by the next month he was in a relationship she found out today about it. He wasn’t even talking to her until this year and he decided to try”again “ and even wants a 👶🏻 baby. He told her he doesn’t talk to the girl anymore. But he won’t let her. Heck his phone and she only knew about the girl because she hacked her phone. I told her to leave him but she think I am biase. Help a girl here to help my bestie. I just want her to be happy no matter if I don’t like him