Do you think you're as much looking for little security, someone you can trust, looking for someone to be there for you in amongst the "missing him"? If so he really doesn't sound like he can give you that to me and it does sound like you did the right thing breaking up with him.
Of course you're probably going to have a lot of conflicting emotions right now trying to make sense of things and having memories/confusion (?) going around in your head, but if you just give yourself a little more time then you're going to know more in yourself that whatever happens you've made the right move. Even if it was only a few months I'm sure you invested in the relationship working so it's got to hurt. Maybe if you keep seeing it as it's better you ended it now than down the line that may help a bit though.
As for his attitude afterwards then, to me, it just sounds like a reflection of how insensitive he sounded in the relationship, so maybe proves you right in ending it?
As for feeling that you weren't worth more well perhaps spin that around to HE wasn't worth YOU. Just because he couldn't see how worthwhile you are doesn't mean it's not true and hey, why go with his judgement if he's the kind of person who can treat people that way??? Why give his judgement more respect than it needs.
I do know it's probably hit you hard though, just remember that not everyone is going to be like him and you now have the opportunity to meet someone better at some point in time.
So any thoughts on the relationship you had with him, remind yourself they don't matter, what's done is done and you now have chance to move onto onwards and upwards.
Best wishes
Alison