I`ve been there and done that too. I wasted a year and a half, and about 20 grand on a chick that was only concerned about herself and what was in it for her.
Like others have said, I was too"whipped".
I did finally get out, and it was on my terms.
There is nothing more redeaming than being the one that ends it. You just have to be objective enough to know where to draw the line.
If you don`t have a common ground and mutual respect, as well as similiar intrests, your relationship is doomed. That`s not to say you wouldn`t be able to stay together forever, BUT forever is a LLLOOooonngg time when your not happy.
I would suggest cutting your losses and looking for someone that has more respect for you, as well as common intrest or hobbies.
My .02