You are correct in your feelings to feel betrayed and disappointed by his behavior.
Different people find different things sexually stimulating (yet, if someone is in a relationship, they ought not to ignore the needs of the other person)
It seems that you have already let him know what you feel (but you are also desiring sexual intimacy not just a platonic relationship)
It may be best to see a counselor who specializes in gay issues and have face to face couple's therapy to help each one sort things out. Perhaps he would be willing to go with you. If not, there is not much anyone can do to change another person as that is solely up to that individual. Ask him where does he see the relationship heading in the long term and what is it that his expecting from it.