About this guy.

So I like this guy. We've been friends since high school. He always had a crush on me (even took me to my junior prom) but I never reciprocated the feeling because I feared that a relationship would ruin our friendship. Now we're both in college and we both agreed to give it a try, problem is that I'm moving really soon. I really like him, but I don't want this relationship to be a waste. What should I do?