If he's not calling:
He's learned enough about the two of you together to realize it's not a good idea to carry on, which is a blessing for YOU in the long run!
OR
He's found somebody more interesting (or who will "put out" if that's what he really wants) in which case, seeya bye.
You should know that most men don't like confrontations, especially emotional ones with women. They like to ignore things and hope the problem or issue will go away by itself. There's nothing wrong with that, it's just a different way to cope with unpleasantness.
Us women, on the other hand, like to hash things to death until everybody's just so sick of it they could spit. Sometimes we women could learn a thing or two from men.
Just listen to loud music in your car and watch a lot of really absorbing movies until you don't miss him anymore.
Best of luck. Better things are ahead.