David Letterman’s former assistant on Late Show, Stephanie Birkitt, revealed in her diary that even after she moved in with her boyfriend, CBS producer Robert “Joe” Halderman, she and Dave continued their affair, the New York Post reports.

Halderman later allegedly attempted to extort $2 million from Dave over the affair. Dave and Birkitt reportedly went on romantic hikes last fall at his Montana ranch — the same ranch where he married his longtime girlfriend in March — while Halderman stayed home in Connecticut.

A source tells the NYP that Birkitt reassured her boyfriend that nothing was going on.

“I’m his best friend,” Birkitt told her worried boyfriend about Dave.

Even after Birkitt graduated in June 2008, Dave allegedly tried to take care of her, offering her a job as his personal lawyer, the source reports.

Last night Dave returned to his hosting desk for the first time since revealing he’d had affairs with staff members.

“Wow, that weekend went fast,” he deadpanned in the opening monologue. He insisted that he no longer was having affairs, adding, “You can’t be victimized by criminals.”

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