<human>: I broke up with a GF couple monthes ago but are still friends ( hang out maybe once a week) cause I enjoy her company. I used to live in a residential college before I moved out last year but I still go back every once in a while since my old friends and her are still there.

The problem now is that there's this guy I know (I'm calling him B) who I'm still kinda friends with is hated by almost everyone in the college with good reason. 

He is  known for being a sleaze, likes to provoke people and stirs the pot. He'll say inappropriate things to girls and makes them uncomfortable and has numerous complaints. He also almost got kicked out due to the number of complaints 

When I met him last year he seemed like a al right guy and didn't know about any of that and we also had a lot in common (sports and similar interest). When I see him now he's actually quite normal around me and we still chat like acquaintances. Since I've heard about the things he's done I don't try and associated so much with him any more but I 
still occasionally bum into him and say hi.

The issue now a number of people in college (especially the girls) hate his guts and my ex is one of them. She and others have made recent  complains to the college and the case is being reviewed. She's now angry at me because I acknowledge B's presence and actually talk to him. I actively tell her I don't' approve of what B am glad she made the complaints. I even told her that I personally told B that what I think he does to women is wrong but he laughs and brushes it off. I'm known in the college to be a social person and don't like ignoring people unless they're actually wronged me.

Am I in the wrong? Because I go back occasional, I will definitely bump into him. I hope he gets kicked out since what he does is quite bad but I can't find it in myself to actually hate him or brush him off if he says hi.

Can you give me the gist of the text in a nutshell?
<bot>: My ex is mad that I still casually talk to an acquaintance when I see him because he treats women inappropriately and is a sleaze. I don't associate him much any more but apparently saying hi when I see him is wrong.