They'd take their separate paths, perhaps reluctant at first but eventually learning to embrace the challenges. They would grow. Change. Shift. One gaining control of life, the other finally learning how to let go. They would think of each other often at first, but time would soon make them forget. Forget everything but a tiny piece of themselves that didn't quite feel whole. That longed for something even though they couldn't quite place what it was they missed at all.
It'd probably be years before they saw each other again. Five. Ten. Maybe fifteen. They'd look at each other from across a crowded room and it'd be as an answer to long forgotten question.
Or, they could have both grown so far beyond the other that they hardly recognized each other at all. One would turn to a friend, the other to a new lover. Nothing would be remembered so that nothing more could be forgotten.