Betrayal is becoming more of a common action of human beings. An action becomes betrayal when breaking the trust someone placed on you while you know he or she trusts you.

This can be between, spouses, siblings, neighbours, employer-employees, friends, leader-follower, etc etc. Many say they won't forgive betrayal.

Men cheat on their spouses and expect the spouses to be totally honest to them.  How unjust is this?
When one cheats on his spouse, he should realise his partner(cheating) else is cheating on her spouse as well.

So, as long as you are not a just person ,you can not expect the universe to be just.