I'm attracted to her, but I can't trust her.

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So this girl I know who I'm really good friends with broke up with her boyfriend and I made my move. She said she would go out with me, said she would call me back, and never did. I decided to give it a second shot, asked her again, she said yeah, and once again didn't call when she said she would. At that point I was fed up, and the attraction in me for her was gone. Well, a few days ago a friend and I went over to her house. My friend left early and we talked a little. I could tell by the way she was talking that she was attracted to me and she was constantly trying to figure out if I liked her back. At the time, I didn't, and I told her that I didn't want to date her. Before I left she asked for a hug, and said how it was the first hug we ever shared. Then I left. Well, now that she expressed that she liked me, and I expressed how I didn't want to date her, she is now trying to get my best friend, who is confused as to what he should do (but that's another story). Now, after that conversation with her, old feelings of attraction towards her have sprouted inside me. I still don't want to date her, because she didn't call twice (how can I trust her?), and she is always saying how she is fed up with people and I don't want to have all that dumped on me. The attraction I feel for her now isn't anything desperate or extreme like "I need her!", nothing like I had before, but it's just an annoyance. I'm wondering if you guys have any thoughts on this. Thanks.