Once a cheater always a cheater? Is it always true?

I found out at work yesterday that my boyfriend has been cheating on me for majority of my relationship. I unfortunately have a very kind and forgiving heart. I am still dating him but if it happens again he can just have the slut. I have set the standards that I expect. I went to his mother and told her and she kicked him out. He is learning his lesson now from when he took everyone for granted. How many of you have had gotten back with your ex after they cheated and you had a healthy, functional, successful relationship?

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