Exactly gread advice from Wonka, remember wanted a D its a choice. The fact that she wants a D doesnt made you a criminal, and the fact that she doesnt like things doesnt made those things real, try to find out what its real and what you can change, and if something smells bad dont believe it just because she says that. I took all the issues in my relationship as my fault, and agreed I should be treated bad because... And nothing more far away from reality.
Take decissions based on your well being, balancing those decissions to not harm others, and dont let others take decissions for their well being that will hurt you, you have the same right to not be harm as she does.
When the student its ready, the teacher will appear... Even after all this time the sun never says to the Earth, "You owe me." Look what happens with a love like that,It lights the whole sky.