How to get over someone you can't move away from?

So, I am in love with this guy. We used to be great friends, he is nice, but not interested in me and has a girlfriend. Of course I want to leave him alone and give myself a break as well, but the thing is I am 'forced' to work with him and be around him.

Any advice on how to deal with this?
How to get over someone you can't move away from?
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