You have to take baby steps. Deleting his number was a good start.
As for getting over the guy? There really isn't a cure for that. The only cure is time. Try and find ways to distract yourself when you see him. Find reasons to dislike him to help you get over him faster.
Sometimes talking about it really helps, so if you need anyone to talk to, you can PM if you'd like.
Just give it time, you'll heal.
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I look ahead at all the plans that we made
And the dreams that we had
I'm in a world that tries to take them away
Oh but I'm taking them back