Should I stay or leave?

My wife has confessed to me that she carried on a heavy flirtation for a week. It involved suggestive talk, touching, but when the man asked for a meeting she called it off. When she first told me, I quickly forgave her for what sounded like a close call, but she continues to confess more details to me. She had an affair six years ago, and it took me about three years to get it out of my mind. I just don't know where to go on this anymore.