(CNN) -- The top U.S. commander in Afghanistan allegedly exchanged "flirtatious" e-mails with a woman who was supposedly being threatened by the CIA director's mistress, according to a Defense Department official. Now, the commander,, is being investigated by the Defense Department, the woman who traded flirty e-mails with Allen is asking for privacy, and the home of the former spy chief's lover has been searched by the FBI. Confused? You're not alone. These are the latest developments in the complicated and widening scandal that began with CIA Director David Petraeus and two women with military connections, and has now ensnared Allen. It also threatens to bog down a newly re-elected President Barack Obama. His administration is preparing for critical fiscal negotiations with...