My best friend and I are drifting apart?

Sadly, this happens a lot. To have had a friend that long is really great but people do change. When you aren't in someone's life everyday it's easy to drift apart. I'm lucky to have some friends that I barely see but we know that we still care about each other and when we do see each other it's like no time has passed at all. When you can, try to visit. Try to call once a month to ask how she is. If you can remain some kind of friends after moving an hour away, it's better than nothing. It's a sad thing, but people change and I know you will too. If she's so flaky she can't keep up being friends a little then you will probably find better friends eventually. Good luck.