How to get over a breakup?

I am hurting a lot and don't know what to do. I know they say you should focus your energy on other things and other people but I'm finding it hard being an introvert. I only have one friend and my one hobby is writing which I am dealing with writers block at the moment so I don't have anything else to focus on.

I miss him terribly and it's taken a toll on my spirit and mind.
How to get over a breakup?
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