Another Woman's Husband

I recently read Angel Mechelle's Another Woman's Husband and it was a good read. Prior to reading it, I had my own preconcieved notion about the other woman, Bree. However, after reading the book my attitude about infidelity remains the same. I'm not for it, but my heart softened toward Bree.
My question for today is: Who deserves the blame when cheating occurs in a marriage? Is it the man's fault when he goes out and cheats? Is it his wife's fault that he cheats? I mean does she put a gun to his head and force him to cheat? What is the responsibility of the other woman? Is it possible to be in love with two individuals at the same time?

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