What does this girl want from me? Is there a nice way to tell her to leave me alone?

Anonymous
There's this girl who gives me a lot of attention. All the time she is trying to start conversation and asking me stupid questions and trying too hard. I try not to be a jerk and I talk to her and most of the time its fun but then from one day to the next, she starts being all difficult and bitchy and she claims its because I'm too clingy and I don't leave her alone. So fine, I leave her alone and mind my own business but if I dare being quiet or ignoring her when she is in a chatty mood, then I'm being mean to her and I make her feel like crap.

She believes she has this power to figure me out, she claims she can tell when I'm in a bad mood just by looking at my face and I', not entitled to EVER be upset or having a bad day because she takes it as me being mean to her.

WHat pisses me off is that she will go on and on talking to me, teasing me and treating me like she has known me for years and just seeming too comfortable with me but when I talk to her, she claims that I'm trying to put the moves on her because I talk too much, while she is the one getting upset when I don't talk to her and being all clingy and just paying too much attention to my facial expressions and overall behavior. One time I told her to please stop bugging me and let me mind my own business and she almost cried and I had to hear how mean I was being. Is she a crazy person or what does she want from me?
What does this girl want from me? Is there a nice way to tell her to leave me alone?
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