How do I forget a girl?

She was my first girlfriend and we agreed to get married when we got out of high school... She was actually a total fuckgirl and just used me for a few months.. I did sort of realize that but I was totally in love with her... And then she cheated on me and we broke up. Afterwards she started rubbing me in the face how many guys she's fucking now... I would never seriously want her back. I even kinda hate her. But at the same time I can't get over her. I still feel like I'm totally in love with her even though it's been a few months already.. I blocked her almost on all social media and am trying to forget her.. But it just doesn't work.. how do you get over someone? And how long does it take?
How do I forget a girl?
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