I'm scared i'll never forget about her. What should I do?

We've been classmates for years, she confessed to me during the 2nd year, but i didn't like her back then (she was physically similar, but i didn't know her as a person). Long story short, she got a boyfriend, they broke up more than 1 year ago, i fell in love with her and now i'm trying to forget about her because i guess she's not interested. I've been like this for around 3 years right now, and i'm scared i'll never stop thinking about her. i found out i like her because we've spent so many time together, and i really started loving her from any aspect.

I'm scared i'll never forget about her. What should I do?
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