I Am Very Concerned That My Fiance Doesnt Find Me

I am very concerned that My fiance doesnt find me attractive. He has never slept in the same bed with me. We have been together for four years and have had sex 3 times. He is epileptic with Periphial Neuropathy. If I try to discuss ED problems with him he just gets mad. I am worried that his Keppra is causing his problems. He has been on this medication for about 3 years now and never touches me. He has no sex drive and and can only acheive a full erection every 8 months or so. What can I do?? I am starting to take this personally since he won't talk to me about it.