I don't know all of the details of your situation, but it is starting to sound like a very familiar story. More times that I can count, I've had two good friends go through one of these "one-sided" breakups, so I've heard both sides of the story over and over again. My guess is, even though she doesn't want to be romantically involved with you, she still has a lot of affection for you, and your shared history gives her a "comfort zone" with you. So, it is in her best interests ti try to keep you around as a friend. Now I may be way off-base with this, butyour description of her behavior is so close to how I've behaved in the past, I have to wonder if her motivations might be the same. She told you that she was having problems with the relationship for a long time, but she stayed with you until she had someone else to go to. That makes me think that she is not very secure about being alone. So, even if it is subconscious, she may feel safer encouraging your affections, so she has you around as a "safety net" while this other relationship is new. So, I guess what I'm saying, in waaaaay too many words, is that I agree with darkeyes...she may not know she's doing it, but there's a good shot she's playing "mind games" to keep you on the hook.

I also think darkeyes' idea to put some distance between you and her is a great one. It may hurt to not see her, but you set yourself up for a lot more hurt if you let her keep you on a string. I sort of think a healthy amount of anger is good for a breakup. My girlfriends and I have a favorite way of dealing with breakup...a good old-fashioned male-bashing session fueled with plenty wine. It may not be realistic, but sheer animosity seems to be less painful than unrequited hope for reconciliation.

Well, i wish I could have given you more encouragement...good luck, and I'll be thinking of you.

*hugs*
mj