Being the one he cheated on him with

[pellaz]

sometime in Your life you will be the one cheating.
It will happen, like a lot of things good bad experiences and until that time you have experienced that you will feel "absolutely disgusted". I think you are naive and overly simple.

along those lines you need to be careful. Not everyone lives their life as you do, in fact everyone is incredibly different. Pick and choose what makes up your moral code:
-what is an immediate deal breaker
-what is unacceptable but allow one more chance
-what to ignore
-acknowledge what needs infrequent maintenance
-what behaviors to emulate in your own life

for me; gay men are not falling from trees, yet.
i would date that boy again; its his choice to cheat on his partner. If he broke up with his partner i would date him again as possible relationship material with certain rules in place. If he was married but gay out to himself Hmmm ...