Originally Posted by Real Men Wear Green
That was a reply to the OP's useless speculation. The explanation for him resigning I heard was that any CIA operative that had blackmail material out there was considered compromised and a lower-ranking operative would get canned for this so he was holding himself to the same standard. I don't know about all of that myself and it's certainly not blackmail material if everyone knows it happened but it's certainly true that high-level government appointees get fired over scandals.
How convenient that the Director of the CIA resigns the week before the Benghazi hearings begin again in Congress over something that had zero effect on his ability to do his job.