What happened with him before can be important in helping you get through this, because after all it didn't work out for a reason. If you can learn and grow from your experience, it would not be a total waste of time and energy and emotion. One thing to really keep in mind though is that while you want him to be your "one", he is not the only "one" for you out there. You remember the good times you had together and you kind of make it a fantasy after not talking to him for a while, and that itself can keep you hooked. If he was really interested still, I think he would have found some way to contact you. If he doesn't feel the same way as you, how could it possibly work?
And if you really want to "get past him", you are going to have open yourself up to somebody else and give them a chance. Otherwise you are just going to be looking back at him. I'm not saying you should just throw yourself at the first guy that comes your way, but take the time to really get to know somebody and take it slow with them so you can learn to appreciate what they are offering and allow a connection to form. I think many people can attest to the person that they married might not have been the one at first and an unlikely candidate, but was proven wrong over time.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.