However, tell her WHAT you know, but not HOW you know! Keep her guessing. To me that is one of the biggest tools in the cheated on spouse's arsenal is when the cheating spouse is constantly wondering "How did he find out? How did he know?"
I recommend one better.
Never reveal your source(s) of intel.
Do not reveal WHAT you know. Do not reveal HOW you know.
Just let her know that you DO know. "Stop, we both know you are lying" or "I am not stupid."
