I guarantee someone saw/heard/uncovered something and she knew her goose was cooked, and she was living on borrowed time. No way you just decide to exorcise your demons and come clean completely organically with something of this caliber. I guarantee it was a thing where some coworker, media member, etc saw them together, or Sarge bragged about it to the wrong folks, and she was just trying to beat the media to the punch. Because for whatever reason, we always tend to think a LITTLE better when someone comes forth, rather than getting forcibly outed, or worse yet - denying denying denying, followed by being proven guilty. Given her husbands appearance, and status as a high academia kook, he's probably one of those dudes that's into that. Hell, he probably arranged the "dates" himself.