You did not abuse him. He is the person in position of power. He is the responsible one. I could punch him in the face for the terrible way he has handled your therapy. I know that's really painful to see. It makes you feel like you have some sort of control and power in the relationship when you blame yourself, but this is not your fault. You did not have the power. The only power you have now is to leave, as soon as you can. And then please, even though this has been overwhelmingly painful, find a T who knows what the hell they're doing and tell them and let them help you.