I can't get over my ex?

we dated for almost 4 months and broke up twice. he ended it because he can't handle being in a relationship. it was back in the beginning of May and he's a senior in High school (I'm a freshman in college) now. how do I get over him.
side note: it was only 4 months but it was a really affection filled relationship.
I can't get over my ex?
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