The sex may be good but the relationship is not. A man with any integrity doesn't continue to sleep with a woman after he tells her she doesn't turn him on anymore. And, any woman with any brains or self-respect would refuse to be a doormat or should I say sexmat. This is a pretty dumb question. There are no dumb questions and you shouldn't feel stupid.
Many women never climax and they just accept it.
I commend you for your courage to be proactive and for your desire to want to be fulfilled. For the best advice, contact a sex therapist who has been trained in this area. We talked all the time before we went out. I feel very uncomfortable with myself because I get really shy when I'm with her. I want to be the best boyfriend I can be to her.