2 of my friends were dating and I knew the girl would cheat on the guy because AWALT but I didn't talk about it to him. Now she cheated on him but they both are asking me to help. What do I do? Do I stay outta this?

girl says she loves him but doesn't know why she did this. boy is braindead and won't say "fuck that bitch" after some time she says he was blah blah and starts to reason her actions to avoid slut shaming ig

I can say this won't work out and he should say fuck that bitch already, and I know we all were like this guy at a time, so what would be the best thing to say him? The girl idrc but her friends are hot and they come to parties so I want to keep her close too.

I could say I'm not getting in drama but I have been in this guy's position and could NOT recover so easily back then so I want to help him. What would you suggest?