Well, I am sorry first of all. Breaking up... sucks! :(
Ok, time to move on girl. Yes, it may sound hard and heartless, but you tried to talk with him and you've recieved no answer. It is not a matter of you, it is a mater of him. Begging for an answer will only hurt you more and more, since it is unlikely for him to tell you what is really going on. I mean, if he would want you to know, he would have already explained himself!
I know that you love him and yes, you will be a little sad and down for a while, and there is no better time to give you time for *yourself*. Do things you enjoy and that you can do by yourself: rent a movie, order your favorite food and have a 'yourself' time. Let the wound heal. Please do not try and jump on another relationship right away, because it may hurt you even more in the long run.
Follow your heart and think with your brains. I know you will do fine. And if he ever decides to call you, do not be harsh! Human beings are complex individuals, and if he wants to explain himself, let him do. But if you feel you're over him, there is no need to turn back in time and waste more time with someone you know has already broken your heart.
Hun, be strong. You are strong. And we care about you. Keep us posted. I know everything will be fine.
-Jean