I beg to differ. I think Hillary has always known her husband was a cheat and put up with it as long as their political path kept climbing. It was a calculated risk and it looks like it payed off in a world where celebrity holds more sway than honor.
When asked if Hillary kept a diary:
"Heavens no! It would get subpoenaed. I can't write anything down [laughing]. May 28, 1996.