Sorry you're hurting but take heart... with zero contact (and that means no facebook stalking either) you'll be past this in due time. You're going to miss one another, you've been in each others lives and it takes time to rehab from the habit of having him there.
You will hurt less when you accept that you've done the right thing because its better to do it now rather then when you're married and he's not changed. You're basically incompatible in life goals and basic sensibilities so you need to be free in order to find someone who is more in sync with you.
Feel better soon.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion