[Coffee.]

I would try not to feel so bad-he's the one that is cheating. While you were aware and probably should have stopped him, you can't take back the past and redo it, but if he does try anything with you in the future, I'd just say no at that point. I hope for the girlfriend's sake he gets some guts and tells her, after also cheating on her in the past. Maybe if you're in touch with him, you can encourage it. If he's sleeping with other people, that's putting her in danger of STIs, and it would give her the chance to break up with him if that's what she wanted. But if you're not in touch with him, it's his problem. Sorry about this awful situation!