i have to say, i went through a similar situation last year when my boyfriend went off to school, and i am about to go through it again when i leave for college.
honestly, an hour distance is not as much as it seems like. however, i would strongly recommend not saying things like "i'll be home every weekend." if you start making commitments like that when you're about to be in a new place with new people and wanting to settle in and bond and go to parties, going home every weekend will seem like a chore. i say go home when you want to, but don't make any promises. i'm sure your boyfriend will understand.
but i do totally understand why you're feeling nervous. and really there's nothing you can do except hope it works out, do everything you can to work out, and tell yourself that you won't let it make you miserable. that is, keep in mind "que sera sera," whatever happens happens, and you shouldn't stress about things you have no control over (like moving an hour away from your boyfriend.)
instead, focus on the good stuff - you're about to go away and try new things and live on your own!
Boys and girls in America have such a sad time together; sophistication demands that they submit to sex immediately without proper preliminary talk. Not courting talk - real straight talk about souls - for life is holy and every moment is precious. I heard the Denver and Rio Grande locamotive howling off in the mountains. I wanted to pursue my star further. -Kerouac