I am in your same boat. My boyfriend and me just broke up. I go to a private school in PA and he live in Alabama where I am from. The best thing you can do is try to remember that God has a plan for you, and it isn't with this guy. I promise you will find another guy, and he will be 10X better than this guy that is taken.
On a side note...lml....make him extremely jealous that he can't have you. a guy loves when they see a girl having more fun than him and his girl are having. It makes you seem like a better choice than the girl that he is with.
I know it might seem like a really hard thing to do but really as long as you have faith in yourself you can do it. Make sure you keep yourself busy. Hangout with friends and try your best to stay away from him. Try finding someone else you like who is not taken and see if they like you back. Just don't lose hope, Good Luck :)