How do you get over someone?

Hi all,
I posted recently about a recent break up I had because I am almost certain my partner was cheating on me; all the responses I got agreed with me. Now that that I am certain I've made the right choice in calling it off, I'm unsure how to deal with the break up. I do not have any friends and no family; I do work out regularly and have many hobbies but I can't seem to stop thinking about this person. I am so heartbroken and extremely depressed (I've had a lot going on prior to this too). Advice please:(
How do you get over someone?
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