***(As I recall, the reason Hillary was outraged was because he was found out, not over yet another dalliance.)***
He didn't HAVE to tell Hellary. Steponallofus said HE told her about Monica frequently being int he Oval Office alone with Bubba. THAT'S WHAT HILLARY KNEW, AND WHEN SHE KNEW IT.
I thought it was Kendall that told her (wink, wink).