I think you need to ask yourself what YOU want; do you really want to get back with him? Take your time and think about that (take a week if that's what it takes to delve deep and get an accurate answer).
If you decide that you do, the problems that led to your breakup haven't yet been resolved. You could let him know that you'd like to talk about some stuff with him, then let him know that you're interested in getting back together. If he seems receptive, bring up the issues that led to your break up and ask him if he'd be willing to work with you to address them. Both of you should take an objective look at what caused your breakup and see if you're willing to do something about it.
If the answer turns out to be no (you meet someone else, your feelings change over time, etc), then move on. There are PLENTY of people out there.
