Usually after someone stabs you in the back and looses your trust you will hold a grudge toward them for a long time. It is hard to forgive someone who emotionally hurt you. Although we shouldn't act like that. Jesus revolution states, "Seeing the Savior whom he had sinned against, brought Peter to a place of sorrow for his sin, repentance (turning back to Jesus), and restoration (accepting forgiveness) from the Anointed Messiah, the Lord Jesus Christ." Jesus is always forgiving toward his children when we disobey him so we should be forgiving to our friends and enemies.
Roy moved on in life and tried to not let his situation with Harriet get in the way of loving and trusting his new wife memo Paris.
You cant let betrayal ruin your trust forever.