As women we tend to feel a need to attack the other woman instead of focusing on the man in question. For simplicity purpose we’ll say the woman wasn’t even aware the guy had a woman (or maybe she was). Should you hold the other woman accountable for your man’s alleged indiscretions?
If you are involved with a man whom you think is unfaithful, would it not be in your best interest to reevaluate your situation with your man? The woman on the side has no commitment or obligation to you or your relationship. I don’t mean to appear unsympathetic to a woman whose man is allegedly cheating on her, but we’re no longer in high school. And as a grown woman you can’t go around thinking you can attack every woman you think is messing with your guy. In general the golden rule is men will do whatever we as women will allow. It is also a rule to follow one’s instinct/intuition. If you believe your mate is cheating, they probably are.
I am not condoning a cheating mate’s behavior, but if you do find yourself in that situation it’s better to resolve the problem between the two of you. But what do I know; I’m just another single woman minus a redundant relationship. (I think I'll be alright)