How do I get over an ex?

It sounds crazy but I have been hung up on this guy for like 5 years. Its especially hard to get over him cos before we dated we were best friends and even after we broke up (due to a misunderstanding not cos we didn't ahve feelings for each other anymore) we still stayed friends. But I wanna finally get over him and move on cos he has as well...
How do I get over an ex?
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