The girl who has changed at least once will definitely repeat it! Be sure of this! Especially if you forgive her after that. The first time she confesses, she will be ashamed and for some time she will be the most obedient woman in your life. but this will last until the moment when she wants to taste the forbidden fruit again. Only for the second, third or fourth time you will not know anything, but she will feel calm, since you have already forgiven her once, which means you can forgive more. Output? You should never forgive betrayal. The one who has changed once - will change more and more.