In my opinion it is best to cut ties and move on.
Unrequited love is like being in hell.
Avoidance is the best cure, if you don’t see them, you can’t grovel at their feet (and let it be said I have been known to grovel)
Yes, the answer is to move on and let their memory slowly fade away. And if you do happen to find yourself dwelling on them, make sure you dwell on all the bad things about them…