I voted "I don't know" because there are so many variables.
In my experience, he would have never told me to begin with. He was just a player. My anger, when I found out AFTER I kicked him out of the house, was at my neighbor. She knew and didn't tell me. She knew he was abusive and that I wanted out of the relationship. Knowing what he was doing would have ended that sick relationship a whole lot earlier and it would have been to my advantage as well as the two kids I had by him... which, BTW, were the only two kids he's had within the bounds of marriage. He's got a whole line of them from NY to CA.
I'm afraid that infidelity is the only thing that would break up a relationship with me. I can't say I wouldn't forgive, because I have. I don't want to live with that B******* tied to my back for the rest of my life! I've cut him off of me.
Angry? Just a bit, but at myself for making such a desperate decision to stay involved with him in the first place!
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.