I'm scared college will ruin my relationship!

I've been with my boyfriend for 6 months and I've known him for 3 years. He's not just my boyfriend he's also my best friend. I am completely in love with him and I know he loves me to. he's currently in college. we had a chat the other night about when I start college, and he's scared of me not having enough time for him. I Don't want to lose him, but I don't know what to expect when college starts... someones advice?
I'm scared college will ruin my relationship!
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