Nervous to date

So, this guy at my school really likes me, and I like him. I've told him I want to take things slow, as I've never dated or anything before. He mentioned yesterday that he really wants to go on a proper date soon.

Today I realized while driving home from school one of the reasons I'm so nervous to start dating or anything. This is the fact that all relationships end in either a) a break up, or b) marriage...