I know exactly what you're talking about girl. I feel extremely emotionally dependent on my bf too. If we fight I would feel depressed until we make it up. I depend on him a lot. So yes, I understand.
I agree with glitterinmyveins, that man are usually more attracted to their women if they are independent. But I can understand it's hard being independent if you have a controlling man.
Start with easy moves - get into some hobby, maybe as was adviced before go see some friends, and well, as you said get back to school!
I don't think the break up should be considered, because well, we all have different characters, but gotta keep in mind the good things about the relationship and the happieness it brings you.
Good luck!