If your paths never cross then I would try to forget about him if I was you.
Merle is right, your quaility of life will improve if you do not waste time thinking about this person. I know that revenge and payback might sound great and something which will make you feel good, but I suspect that it is a very bad way to waste a lot of time.
_________________
Health is a state of physical, mental and social wellbeing and not merely the absence of disease or infirmity

I am not a jigsaw, I am a free man !
Diagnosed under the DSM5 rules with autism spectrum disorder, under DSM4 psychologist said would have been AS (299.80) but I suspect that I am somewhere between 299.80 and 299.00 (Autism) under DSM4.