Most Helpful Guy
First and foremost, you should know that people often over dramatize when breaking up so as to deter the other person from trying to fix things. He most likely did love you and was not at all miserable or thought of you as a horrible girlfriend.
Now with that out of the way, there is nothing wrong with grieving. Let yourself be sad for a bit. There's a beauty to it. You're sad because it was meaningful to you. Cry as much as you can and then move on. It is always easier once you've mourned.
Most Helpful Girl
Right now, just give yourself time to get over it and don't isolate yourself from positive friends who can help lift you up. Once you're at the point where you can take a look back at the relationship objectively and not emotionally (which again takes time), you should look for what you can learn from this relationship and the things you'd do differently in your next relationship. This is a time for personal growth.
I also strongly suggest not contacting him for quite a while. Don't be one of those people that cheat themselves into thinking their emotions have totally gone away and they're ready to be "friends" with their exes. All that causes is unnecessary pain, confusion, and more hurt feelings.