I think you should occupy your time with other things. Relationships probably are not a great idea right now. I think you should pick up a new hobby, do things you love, pick up a hobby you haven't done in a while, see friends, talk to somebody, do art, and keep your mind off of him. I would suggest blocking this person, not talking to them and moving on. I obviously don't know your situation, but i've been in a similar situation. Within time, you should move onto another person, but right now moving onto another person doesn't seem like a great idea. I would also suggest that therapy can be a great tool if you're completely lost and have nobody to listen to you.