If you are already in therapy, please get a different therapist. If not, therapy would be a good place to help you work through this.

I think a number of people have already told you this person is not treating you well and no amount of ruminating on why will help him be better. Relationships shouldn't be this hard. He is not treating you in an acceptable manner and that is it. You seem like you're trying to make this okay in your mind or find the key that unlocks the "puzzle" that is him. He's not a puzzle. His actions say everything about him.