CIA director's downfall rooted in jealousy

Author Paula Broadwell with Gen. David Petraeus aboard a Defense Department plane. Broadwell wrote the book "All In: The Education of General David Petraeus."
Handout/Command Sergeant Major Marvin L. Hill

(CBS News) WASHINGTON - Two days after the abrupt resignation of CIA Director David Petraeus, more details are emerging about the chain of events that led to his departure.

Sources say the downfall of CIA Director David Petraeus was rooted in jealously.

The FBI uncovered evidence of an affair between Petraeus and his biographer Paula Broadwell after she sent harassing messages to another woman who Broadwell thought was too close to Petraeus.

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Sources have identified the second woman as 37-year-old Jill Kelley of the Tampa area. CBS News has been told Kelley is a civilian who does work for the U.S. Central Command.

Petraeus headed the Central Command from from late 2008 to mid-2010 and during that time presented Kelley and her husband an award for raising money to pay for junior enlisted men and women to attend military balls.

Petraeus has told friends that he had no romantic involvement with Kelley and only saw her when she was with her husband. Law enforcement officials say they've found no evidence to refute that, and describe Kelley as a victim who received and reported threatening messages.

Some close to Petraeus say he's told them the affair with Broadwell began about two months after he took over the Central Intelligence Agency in September 2011, and the affair ended about four months.

Friends of Petraeus say he described the trysts with Broadwell as "infrequent," and he said he never pursued her after the affair ended.

Law enforcement officials stress Kelley is in no trouble. In fact, the entire FBI investigation is likely to end with no one being charged with a crime. The FBI investigation in the end found only a personal affair, and no concerns about national security.