A. I know where you are coming from. I, too, once felt betrayed and unjustly treated and felt the same. But the Torah forbids us to take revenge, no matter how human and natural a trait it is. An allowance would be if others need to be warned about their negative and destructive behavior, to avoid future issues, then there would be some allowance to share this info in a constructive manner, as long as it is not vengeful and hateful. Also if there is some way for you to be repaid your losses etc, that would be another allowance, as long as its through a just and legal system. Otherwise, at the end of the day, simply getting back at them would not heal the hurt in your heart.
