When your best friend moves away, the friendship changes shape. Changing shape is not the same as ending.

Distance changes what a friendship is made of rather than whether it exists. The daily, incidental part goes, and what remains has to be chosen on purpose: calls, visits, messages about nothing. The shift feels like loss because the easy version has gone, and the thing underneath can carry on if you both want it to.

Agree on something regular instead of leaving it to whoever remembers, since good intentions rarely survive a busy term. Keep sending the pointless small stuff, because that is what friendships actually run on. Expect it to be awkward for a while and the next visit to be easy.