You entered and left as two completely different people.
(Hopefully) you learned a ton, but it always seems a few lessons were learned a bit too late.
Nostalgia hits often.
But, at the end of the day, remember to not be the creepy oldie who can’t seem to let go; move on.
If your lives cross paths in the future then maybe it was meant to be but until then…yes, don’t be the “creepy oldie”