How do I forget a girl?

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So there's this redhead in my class and I'm pretty much obsessed with her. She's not really that beautiful but she's got some really cute eyes and I honestly don't know what to do to just stop giving a shit about her.

It's not that I only like her, I also like other girls but I'm too much of a shy asshole to talk to a completely random and ask her number, and the few times I did they didn't go so well.

I already hit the gym and try my best not to talk to her but it's useless.

I tried blocking her on whatsapp but she literally got angry at me and the next day I saw her in the class she was crying. Told her she was toxic and she just told me that "Then she should just kill herself"

Didn't give a shit, just walked away, finished class, hit the gym, and get a message.

And obviously it's her wanting to finish the discussion, and ofc I fell for the bait.

I'm aware she's crazy AF and she's bad for my life but I can't give up on her, please help.