Why are girls so confusing, does she want to be left alone or not?

Anonymous
There's this girl who, according to her, doesn't like me. SHe calls me annoying and irritating and all that stuff. So I try to keep to myself but after a while she will start calling me names, teasing me and trying to have a conversation with me and if I ignore her, she gets FURIOUS at me. When we do talk, we seem to have a great time, at least I feel it that way and I can see she is always smiling and giving me smartass answers so I respond to her and our friends crack up when me and her have an "argument" but according to her, she doesn't like it.

What am I supposed to do here? she is a bit younger than me and she has never had a boyfriend but she seems comfortable around other guys (as in being nice to them and not arguing over little things) but with me its like she turns into a different person and has even told me that I'm so annoying she wants me to punch me in the face (and that in her head she already has) but when I leave her alone, she starts bugging me, what can I do?
Why are girls so confusing, does she want to be left alone or not?
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