maybe

Maybe I just don't love her enough.
Maybe I am not good enough.
Maybe I am not the one.
Maybe I am on the fault.
Maybe we should not be together.
Maybe I should let her go...

What should I do now?

Past 2 days, the same girl have make my heart drop to the bottomless pit. I don't know what I want now and I do not know what should I do. Is my thinking to immature? Or I give her too much freedom? 
Sometimes the things she wanted I unable to give her. Isit her expectation is too high? Or just I unable to reach her standard?
I keep thinking what will be the best solution for the two of us. But I unable to think of anything.
This two days my head keep thinking about the negative stuff. I really on the verge want to break up with her. If I can't help her and be there for her, let other guy do it. Cause if I can't do it, let other do it. That's the best solution I can think of. I am just holding myself back cause I know if I leave her now, she will not make it for her exchange and she will continue to do the wrong think. I guess I must wait till she come back so that at least she got her family to take care of. 
My heart really die.