Proverbs 24:29 “Do not say, ‘I’ll do to them as they have done to me; I’ll pay them back for what they did.'” Revenge is never a Christian option.  Holding a grudge is self-destructive.  To be mentally healthy and have a high level of EQ (which is far more important than a high IQ) one always has to improve themselves and encourage others to do the same.  If someone rejects your encouragement, walk away and carry on with a blessed life.