Not to say you have to do this but just something to think about: If he found someone else more into his wishes and you found someone else who also doesn't like the physical stuff or doesn't want kids? Might be easier in the long run. Other than that yeah all you can do is tell him. Ultimately even if he stays despite being unhappy you can still call it off later. Even like 1 yr later. He prob won't be happy but if you wanna know for sure and you're afraid he will martyr for you. If he leaves then you can find someone more suited to you. Hope this gives you some options