It's holding me back, what should I do?

My boyfriend moved away a month ago, and it's holding me back from everything. We've known each other since 3rd grade. He lived right next time so we always hang out with each other. He was a lonely boy and none of the guys wanted to hang out with him, they thought he was weird and a nerd. We didn't keep in contact since he left, and that's what hurts me the most. It's keeping me from doing my school work. I can't even focus in my classes because he's always my mind. Our break up was mutual, but 10 years is hard to get over. My grades have been slipping and I can't move past all those years.
It's holding me back, what should I do?
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