I know you do, but surely you only want someone in your life that wants to be with you in the same way you want to be with them?
It hurts like hell, but if he has made the decision to be single, then that is his choice and you just have to accept it.
A break-up can be incredibly painful and you are not going to fee great for a while, but think what chasing him will do... he will not miss you, he will not experience what life is like without you in it.
None of us know what will happen, but the best thing you can do is focus on yourself now. Mourn the loss and by all means cry your heart out, but please for your own sake, leave him be. He knows you want him back.
There is nothing constructive (but plenty destructive to your own pride) you can do now so its best to leave things lie... Its horrendously hard, I know that but you have no choice pet..