Worried about future of relationship

I don't know if this is the right thread as this is my first time posting, but my problem is about mine and my brother's relationship. We are currently very close, as we have many similar interests and hobbies, and work at the same place. We spend a lot of time together and have a mutual respect for each other. However, he is planning on moving 2-3 hours away for college next year, and I am worried we won't be as close. Really, I expect we won't be as close, but I worry we won't ever be as close as we are now, and won't be close friends when we both grow up (I am in college and he is about to be) because our lives are taking different paths. I don't have close friends mainly because everytime someone moves away or our lives take slightly different paths that don't cross as much, we gradually lose touch, to the point where we don't really speak at all to each other. I hope my brother and I are closer than these previous friends, but if our lives don't naturally include each other as much, and we only get busier, I am worried we will drift away. I know we will still be friends as we are family, but I don't want to lose my best friend.

Surely, it's HIM you should be telling all of this? I mean, that's how to prevent it happening or lessen its extent as far as is humanly possible?

I know you're feeling like you're losing your best friend, but this happens often in life between people, they grow apart. Not because they want to but because life has it's twists and turns and being an adult, we're called to many thing for many reasons and sometimes it requires us to be away from the people that we care about the most. I know you don't want to, but you have to accept the nature of the situation, and realize that you have to let them go. Not necessarily totally and completely, but how things use to be. He's starting a new chapter in his life and you have to love him enough to let him. Even if it doesn't include you. The best thing you can do is keep the lines of communication open as much as possible, and take advantage of every opportunity to talk to or see this person.