Why is she acting like this??

a few of my friends are hanging out together.. um they say there with two guys but I don't know, um she knows I'm bi and she's dissing me because of it, asks if she wants to go out and knows that I'm not into her, and also says she's in love with me but I think she's lying.. but I'm finding this hard as she's just making my day even worse then it already is...

what can I do/say to her?
Why is she acting like this??
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