Should she leave him?

I have a friend. She's one of my best friends and her parents are strict on her but she has a boy friend and they've been together for 2 years or something close or more than that. And so they don't get to see each other really because her parents don't like him since they are like strict and stuff on her. But today she told me that her boyfriend told her that he cheated on her twice... once when they first got together... and another time about 3 months ago... so my question is should she break up with him? or should she just move on?
Should she leave him?
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