There are some people who cannot deal with sexual intimacy for whatever reason. Some times psychotherapy helps, but more times than not they are frozen and can't move on. I would suggest that you recognize this and move on. If you stay you will not be able to help him (he has not asked for help and seems satisfied with his condition). You on the other hand will just get deeper and more hurt. So again as painful as it is I suggest you drop this relation and move on as it is as it will only get more painful as time passes. Best wishes and god luck.
If you require further clarification or more information, feel free to ask!
Please click the green "ACCEPT" button on this page if you are satisfied with my answer so that I get credit for my work. Your positive feedback is most important and bonuses are always welcomed. If this is a mental health, or medical emergency, please call emergency services (911 in the USA), or go to your nearest Emergency Room. The opinion provided does not replace an evaluation by an appropriate professional. Use of this website DOES NOT CREATE a provider-client relation and this information is for educational purposes only.