How to lose feelings for a girl???

I used to sit beside a girl in class in 2011 and she would always smile, stare at me and be nice to me. Anyways at the end of the semester I added her to facebook and started being mean to her called her ugly, small etc. she just restricted me. Then I kept unfriending her and adding her back and she kept accepting. Anyways I started more convos she responded but then I started being mean again to her and now she just blocks me. I can't stop thinking about her but I don't really like her that much

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