Boyfriends friend?? Description

* ETA: R is going to jail for something I know he didn’t do because I was there & so he’s fighting the charge*

So I’ve been dating this guy for a month (R) and he has a friend named E. R has to spend 30 days in jail starting today and E has approached me to be friends with benefits. I have always been sexually attracted to E and have wanted to get with him but 1) I don’t want to cheat and 2) I think it’s even more fucked up to cheat when they can’t do anything about it (like jail).

But I really want to get with E.

What would you do? There’s no way to contact R.