Why would the FBI be looking at an Army Officer? That doesn’t normally happen. An affair would normally go to Department of the Army Inspector General (DAIG), the office that handles investigations into generals.
Maybe the FBI was looking at her?
Perhaps the regime was using this to blackmail Petraeus into cooperating with their “story” on Bengazi, and perhaps he could not take it anymore, said f*** it and called their bluff and outed himself, though admittedly a day late and a dollar short
You make a very good point, who was SHE in contact with and why?