Anger is one of the human behaviors that are triggered by various factors. It is an involuntary reaction to ill treatment; antagonism towards something that a human believes is wrong and feels unjustified. When anger is for some other person, then it can create a sense of vengeance. Ego never lets a human ask for the apology and on the other side forgiving someone too, is a painful rather complex trait. Forgiveness means (Wade, Bailey, & Shaffer, 2005):
“Replacing the bitter, angry feelings of vengefulness often resulting from a hurt, with positive feelings of goodwill toward the offender”