How does he know that he isn't able to stimulate you? Aren't you supposed to know that and show him how? That seems very selfish on his part to just give up and use an outlet as an excuse for not being with you and trying to stimulate you. He's being disrespectful to your needs and desires, whether he knows it or not. I think maybe you need to slow down with pleasing him or stop alltogether, and see what his reaction is. Has he always been like this?
Or, he could be shy or scared about pleasuring you, just a thought.
