cut her loose from your life....easy!
I have a friend who constantly nagging and talking about this guy that she dated 5 years ago for couple of months and the guy is still in the circle of friends....first I was okay and I was comforting her, but then I found out, she's so obsess and crazy....the guy made it clear that he wants to stay friend and doesn't do anything....and she keeps talking about him...oh...give me a break....I told her to stop talking about him, because it's non-sense....but still she's talking...well...I don't hang out with her anymore....
and I understand how awful this behavior is....so lesson to learn is not doing what she does!
there are tons of happy, positive people out there instead of making friendship with an emotional vampire!