Hi Christie. If I were in your position, I would write him a letter, containing much of what you wrote here and then I would focus on me and getting my needs met in fulfilling and healthy ways.
The letter is good because it allows you to set the record straight and communicate openly and honestly - and he can take it or leave it. I think you are asking yourself good questions, but I also think you need to be careful about accepting the unacceptable when you see him as a little boy and not a man who could and should have been a better partner. It's hard not to hurt for him and hard not to wish it were different, but you walking away in LOVE and HONESTY may be a really amazing gift - to him and to yourself. He may chose to follow, it may be later than you like. But holding on to yourself, your dreams, your needs is the best thing you can do in a situation like this.