if you feel sex is necessary for you to be happy in a relationship, break up. its simply better that way. im aromantic (i figured it out later in the relationship, about a year or so), and my ex was asexual, and we broke up because we couldnt figure out how to continue it in a way thatd satisfy us both. (we broke up like nine months after i found out i was aromantic and romance repulsed) it sounds like he could be aromantic, too, whatever it is i dont recommend "sitting him down and digging deeper and asking about it to learn why he feels like this and how to fix it because its possibly trauma" like other people are suggesting, essentially compromising his, or either of your identities to force yourselves to be together. you can sit down and talk about it, or spend time thinking about it by yourself.