Is sex enough reason to end a relationship?

I have been single for several years, and am recently in a relationship. He is so sweet, and has such a big heart. But I am questioning our compatibility for multiple reasons. The main one, the sex isn’t the best. I have a very high sex drive, and his is much lower. I don’t crave it like I have with past partners. I might be overthinking this, but just wondering what others thoughts are?