Welcome to the "Sisterhood of Broken Hearts".
Ah, the loss of the first "True Love". I'm not making light of your sorrow, I just remember how terrible I felt.
I can try and give you some perspective from "the other side" (I'm 50).
The first "True Love"/relationship is, in most cases a write-off. Very often it's not "based" on anything--no bedrock of friendship that deepens into something else. It's just something that takes you completely by surprise and you're "living on love" (as a friend of mine put it). That's what happened with my first "True Love".
I was a sophomore in college (32 years ago already?!) and it just happened. I think we were both taken with each other. I'd never had a relationship before that (I was "one of the boys" in high school) so that fact that a male thought me attractive as a female made my heart sing. In fact, within a couple of days I wanted to marry him.
We were together for four years, had planned on getting married five years to the day we met. It started out great and then got rocky. Looking back on it I believe that he was cheating on me towards the end. I suspected same but was too afraid to ask (at that time, I'd have preferred being in a bad relationship than no relationship). When the end finally did come I was still devastated and it took time, the help of friends and the keeping of a journal (I highly recommend doing that--you can pour out your heart on the pages).
The first step is always the hardest--close the door on this guy, PERIOD! NO CONTACT!!!! NO TEXTING, NO PHONE CALLS, NO E-MAILS!!! THIS GUY IS DEAD TO YOU!! You have to make yourself walk away. That's what friends are for, to help you along on your journey. It's totally OK to mourn the loss of a relationship and I'll bet you've learned some lessons (cold comfort, I know). Now you need to take what you've learned and apply it. If you have mutual friends I would consider avoiding them for awhile, or at least telling them that (if they bring him up) you don't want to hear about him and walk away. They may be trying to do you a favor but they're not.
Make yourself go out and be amongst people--go to the mall and walk around just window shopping. Sit at a table at the food court and watch people go by. At least you'll be among other people and that might lift your load a bit. Maybe there's an organization or a club that might catch your interest and you can get a friend to go with the first few times? Your heart might not be into it initially but, who knows, you may enjoy it and make some new friends along the way.
As I said earlier any relationship, no matter how casual, must have friendship as its basis. There's absolutely no hurry about getting into one right away--you see what happened the first time. Not all men are clunks like this guy sounds like, you just need to be a little more careful.
I was lucky--many close friends of mine are male. We've shared many experiences and secrets and they "yell" at me when they know I'm doing something I know I shouldn't and vice versa. They were more like brothers. Never had a romantic interest in them nor they in me--we were closer than that. I could cry on their shoulder and they could cry on mine. Those relationships can be more important than any romantic relationship because there isn't any "breaking up" and hard feelings.
Of course you can move on--everything in your post indicates you want to move on. And you will, but it will take time. I'm trying to remember how long it took me to recover--maybe 9 months or so. I dreamed about him for a long time--in fact, I do very occasionally and I don't know what brings it on. In these dreams he's the one pleading for me to come back and I tell him that I'm married (which I am) and am not the least bit interested in having anything to do with him. How much satisfaction is that?
Good luck and please keep posting. We all care about you and want to see you happy again.
You'll deserve to be happy and it's not a big loss... go girl 
