I'm a straight girl deeply in love with a gay guy. How do I get over him?

I've known him since we were 4 and now we are 17. He is currently the only close friend that I have. And I told him that I'm in love with him some months ago. We had a romantic relationship when I was 13, and he was also my first kiss.
I'm a straight girl deeply in love with a gay guy. How do I get over him?
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