Leave in 2 weeks HELP, should I let myself fall for a guy?

I'm heading off to college soon and I'm crushing on a senior in high school. I've only known him a relatively short time in the scheme of things, but I feel like he's one of my best friends. We have hung out everyday, had a lot of fun together, and I love being his friend.

I can't deny it I have a full butterflies in stomach crush on him. I would like the idea of having it more but is it really smart of me to

A) possibly ruin a good friendship if he doesn't feel the same way

B) IF it works out get in a relationship right before I leave for college and be long distance (only hour away)

Should I hold in my feelings and keep him as a really good friend or take a BIG risk and possibly have a relationship at the end of it?