Kathy Allen, wife of General John Allen, unhappy about his close friendship with Jill Kelley

Kathy Allen, wife of General John Allen, the top military commander under investigation for sending “flirty” emails to Jill Kelley, was reportedly unhappy about their close friendship.

Kathy Allen complained to the wife of the civil liaison officer at Central Command in Tampa about the number of emails her husband was receiving from Jill Kelley.

Officials probing the links between General John Allen, 58, and Jill Kelley, 37, said there are 20,000 – 30,000 pages being examined.

One official said the content of the emails were so explicit they amounted to “phone sex”.

John Allen, who is the commander of coalition forces in Afghanistan and due to take up a position as head of NATO, has denied any wrongdoing.

Mark Rosenthal, a civil liaison officer, said Jill Kelley was “loud, ostentatious and revealing” at the parties where she kissed and hugged high-ranking military officials. Mark Rosenthal said Jill Kelley wore revealing short skirts at the parties.

Other sources said Jill Kelley never spoke with anyone below the rank of colonel and focused on those officers with the most power.

Mark Rosenthal was aware the Tampa socialite was bombarding General John Allen with thousands of emails. He said Kathy Allen complained to his wife about the emails and he contacted Jill Kelley to ask her to stop.

Since becoming a key player in the military sex scandal, Jill Kelley has had access denied to the MacDill Air Force base.

Jill Kelley was among a handful of civilians who had easy access to the base in her role as an unpaid liaison officer and “honorary consul”.