Why is she rude to me?

I like this girl in my class and I flirt with her and she seems to like me and giggle and blushes when I flirt with her. She waves at me when she sees me.

However she hangs out with this other girl who acts like a b*tch to me. The other girl tries to avoid ever looking at me or making eye contact, and when she does she gives me these cold stares.
Why is she rude to me?
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