How to get rid of her completely?

I met this girl in the summer and instantly fell for her. It was pretty intense nothing was going to stop me. I'm rarely attracted to others to were it's like this. Honestly it was in my head and for no real reason. She's even from a different country so after a couple of dates I made sure to keep in touch with all year I never wanted to meet other girls because I was into her, but it's not going to work no matter how much I hope because she doesn't like me. It's just I can't stop thinking about her even when I meet other girls.
How to get rid of her completely?
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