Reunions can be weird.
They're weird because the central conceit behind them is that if a group of people shared one thing in common at one point in time, and that one thing is that they happened to occupy the same space for an extended length, then that same group of people will happily occupy another space for a much shorter length of time 10, 25, or even 50 years down the line. Provided that second space has finger sandwiches and punch.
Okay, I will admit that that's admittedly a pretty cynical way to look at relationships that you create during your formative years as a human being.