Why does she keep going back to her ex?

Met a girl and we got along great. Found out from mutual friends she even had a crush on me. I didn't make a move because she had a boyfriend. She didn't tell me that, I found out from another one of our mutual friends. I ask her about the boyfriend that she forgot to mention to me and she tells me he stood her up all the time and wasn't very good to her and they really didn't have much in common. She started to make some moves, being much more flirtatious and even told me she wanted to kiss me but couldn't because she was still with this guy. I told her that I was interested but made it clear I wouldn't do a thing while she was with another guy. We hung out some more and her boyfriend just seemed to stop calling her or didn't even want to hang out with her. She was still making it clear she was interested in me. To be honest I started to fall for her.

One day she tells me she broke up with her guy. I thought "Alright this is great, I'll make my move in a few days. " I didn't want to just jump in right there and ask her out. About 5 days pass and she is back with him. Once again she doesn't tell this directly to me but to another friend. I confront her and she tells me that she basically told him she didn't want to date him exclusively. I looked at her blankly and told her that it sounded like she was working things out with him and that I was pretty sure she had just used me until he could come around again. She denies it , gets pissed, and even starts telling people she in no way was leading me to think it was going to be anything more than friendship. My friends tell me they know that is bullshit. I stop talking to her. I mean altogether. If I see her out I don't say a word. She then asks me if we are friends anymore, that she really misses her friend. I tell her that I can't be her friend because to be honest it went further than that for me. That if I spend more and more time with her I'm just going to have more and more feelings for her and I don't think I can go back to just friends and it's just hurts to much to be around her. This seems to bother her to no end. A friend of ours tells me she was almost in tears because of it. This almost makes me break, I mean I really have feelings for this girl,but I stand my ground. She starts leaving me alone.

A few weeks go by and she breaks it off with the guy again. Once again doesn't tell me but tells a friend. She even starts talking to my ex about me and my ex, yes we are still friends, thinks we would be good together. She doesn't know I know any of this and ,once again, starts asking if we can be friends again.

Does she not get what I told her about how I felt? I mean I was as honest as I could be about it. Why would she think it would be any different now that a few weeks have passed? I told her that I didn't hate her ,that I just felt used. Why is it so damned important to her that I be her friend when she knows I feel more for her than just friends? This girl is driving me nuts!
Why does she keep going back to her ex?
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