<human>: Can you succinctly summarize the text in 1-3 sentences?

I've been a long-time lurker of /r/relationships and I knew you guys could help. I was friends with benefits with "AJ" almost a year ago, although I never had any intentions of dating him and made that very clear.  He would still ask me to be his girlfriend and I repeatedly told him I did not want a a boyfriend, and remind him we were not in a monogamous relationship whenever he brought it up. He moved away to an internship last summer and that's when we ended our relationship.  He asked me one final time to be his girlfriend and I again declined.  He got very angry and thought all our time spent together was a waste. 

Fast forward to January, I had to hear from someone else that my future roommate (we signed a lease in October) has started dating AJ.  Meanwhile, AJ has been spreading rumors and making his distaste for me well known.  Future roommate has actually told me I haven't been invited to certain events because AJ would be there.  Three months ago both AJ and future roommate started using cocaine. (*Just a note, I already talked to a lawyer about the situation and she said it'd be no problem to kick her out of the lease if she was misbehaving and hard drugs are involved)

I was originally going to arrange a meet up with the both of them and try to talk and clear the air, but the more I think about it the angrier I am.  I would never expect them to "ask permission" from me, but a friendly heads-up would have been nice.  She also entered a relationship knowing her boyfriend hated her future roommate. I feel like the ball is in their court. 

I guess my question is should I try to arrange a meet up to clear the air, should I just ignore it, or does anyone have another idea?
<bot>: Future roommate put me in a difficult situation, I'm looking for ideas to defuse the situation and hopefully have a great year.