Girl used to like me, now she acts like she hates me?

Cleeetus
Some girl used to like me but I never went for her. She'd act annoying but I caught on that she liked me. I never went for her, and she went for someone else eventually. I started going for other girls. Now the girl who used to like me is acting really nasty and vicious, and making personal attacks like she's trying to get back at me for something. Why is she acting like that? She has a boyfriend (who she seems like she really loves) so I'm not doing anything wrong dating and we never even dated in the first place.
Girl used to like me, now she acts like she hates me?
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