Spend time on you. Find new hobbies. Try to turn your attention to something else- art, music, poetry. Anything. Something that will take up your timen something you can invest your energy into, lose yourself in. For me, it was writing short stories and drawing.

Remember, it's your brain, your energy, your tears. You have every right to decide to waste no more mental capacity, or happiness on him.

I hope this helps you. I truly do. I know how you're feeling. Also, google how to get over a guy. There are some other tips that I used on there. It worked.

Good luck to you.