Outgrowing friends sometimes means growing back toward them years later. Leave the door unlocked.

Growing apart is not a one way door. People diverge for five years and then, often through nothing more than both having changed again, land somewhere compatible and pick it up with surprisingly little friction. That only works if nothing was burned on the way out.

So leave it open rather than final. Reply when they message, go to the thing when you are home, and skip the conversation where somebody has to be the one who was wrong. One friendly message a year is enough to keep the door from shutting for good.