oh boy.. i just saw the bit about his ex girlfriend. poor guy almost certainly believes that women are all like that, if not on the surface then underneathe. he's probably scared to death to even think this stuff might be enjoyable or else the whole world will fall down on him as an abusive ass. imagine what his ex would think of whatever you might be wishing for... and what her and all her friends and relatives would do if he'd tried that with her.
of course i sympathise with you being left craving and unfulfilled. and i dont know if someone could really change from one extreme like that to the other, unless it just clicks for him sometime. but i do feel bad for him as well... it's a big change in perspective from what he's had before. i would imagine he 's scared to death to try anything for fear you'll like it for a few seconds and then he'll go too far and you and everyone you both know will suddenly be on him for being a bad and abusive person. it's hard for people to understand where the line is between the two.. and some people are afraid to even go near the line. espcially the man because he'll be the one everyone blames if it goes wrong and goes over the line.
anyways i hope you find some resolution to it all. and if it isnt going to happen, never gonna happen, then it's certainly not someone you should make further commitments to unless youre willing to live without this. he is whatever he is and you are what you are. if thats not a fulfilling match for both of you then.. perhaps cutting your losses is an option, while he's still just a boyfriend.