A sortof similar thing happened with my relationship (I'm the guy). My gf was much more experienced than me and wanted to carry our relationship farther after several months, but never said anything about it because she was afraid of offending my sensiblities or seeming like a hornball. In the end when she told me I was totally receptive to the idea, and the only reason I hadn't suggested anything was because I thought she felt the same. However, if he says he is uncomfortable stimulating you, but isnt uncomfortable receiving stimulation, the best guess I can come up with is that he is kindof halfway between ideals. Perhaps he still has some taboos engrained against sexual acts that he has partially rationalized but is trying to make himself feel better by not completely "falling" and doing more. Good luck with figuring things out!