Does sex make the relationship?

Hello all!

So I’ve been with may partner over a year, and sex is a very common thing. However, I feel like it’s the one thing that makes the relationship work. We’re both going off to college soon and he’s going across the county. We’re going to try to make the relationship work. I’m just worried that because our relationship is so physical, it will fall apart. I do love him, so much! I wouldn’t care if we had sex every day or not for a year. We have romantic moments, but just not enough...any help?