Hi,
Im my experience ive had the same problem. My advice to you would be to go talk to him, and speak to him as equals (that is what subs and Doms should be doing when talking about problems and feelings in the relationship(but dont have to)). Tell him what you think about it,and tell him how it makes you feel. There could be a deeper meaning to what he is doing, and/or a way to explore new opportunities with you (sexually). On the other hand even though on the extreme level, that maybe he's not the right Dom for you.(again on the extreme level)