Save or Break The Marriage?

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My friend had once asked me what she should do. She is tired of forgiving her partner and forgetting all the pain she had suffered from him especially in the aspect of faithfulness. She has been in dilemma whether to keep her being wholesome and never get into forbidden affair or do the same thing as her partner does..flirting with another. What should I tell her? Should I say"Girl, you have to save your marriage. Anyway, he is not leaving you though he is just playing around with another". Or should I say" WOman, you've got to break it now for you also deserve to be happy?." Well, she is afraid that his man might fall into the other girl seriously. I dont know how to help her. Would you share your intelligent ideas to solve this problem of my friend?