An advice for my friend and my sister who's boyfriend is cheating on them

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My old classmate from high school and I hang out this morning and I found out that she and her boyfriend just broke up recently because of a third party.. she just found out recently that her boyfriend had gotten his other girlfriend pregnant and had to leave my friend. The sad part is that he's still trying to contact my friend and asks for another chance with their relationship and that he and his other girlfriend is planning to abort their baby. This other girl is only pregnant for 1 month and 26 days.. so what should I advice my friend. I know that she really loves her boyfriend but all I can think for an advice is that she shouldn't give her ex another chance because it is still possible to happen again. And that He will only destroy her future.. Can anyone else share an advice for my friend?? And also for my sister because she is also facing the same situation.