Crazy Ex?!

(Sorry this one is long)
I broke up with my ex about a year ago because she was cheating on me with 5 different people. I had stayed with her for a while because she blackmailed me by saying she'd commit suicide if I ever broke up with her (but when I did she was fine). 
The problem is, she has been trying desperately to get me back even though she has already broken up with her 5 girlfriends/boyfriend and gotten rejected twice by a gay guy and a straight girl. 
I don't really think she actually likes me anymore, but she talks about her fantasies and how she wants to be with me to all of my friends because she knows it'll make its way to me. Is there any way I can help her realize that what she did was (and is) emotionally breaking me apart and that I'm not interested?