Holly Madison, Kendra Wilkinson: 'GND' Star Was Suicidal At The Playboy Mansion, Not Friends WIth Co-Star [VIDEO]

Holly Madison and Kendra Wilkinson are no longer friends.

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Although they starred together on Girls Next Door for years, and lived in the Playboy Mansion at the same time, their relationship has since taken a turn for the worse, as Madison revealed in her new book, Down the Rabbit Hole: Curious Adventures and Cautionary Tales of a Former Playboy Bunny.

According to Madison, she believed she and Wilkinson were friends after the mansion, but then, Wilkinson publicly denied it. "For someone who was all of a sudden trying to act like she was better than Bridget and me, she sure wasn't above using us for publicity when she needed it," Madison said, according to a PEOPLE Magazine report on Wednesday.

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After that, Madison sent her a text message, claiming she was a coward. In response, Wilkinson told her they were "never" friends, insisting their relationship was strictly for work purposes.

Also in her new book, as reported by E! News, Madison revealed she contemplated suicide during her days at the Mansion.

"Maybe it was the pot and the alcohol, but drowning myself seemed like the logical way to escape the ridiculous life I was leading," she explained. "I just couldn't take my misery anymore. Of course my family would be devastated, but I rarely saw them enough for my absence to make a difference."

Madison also wondered whether or not her then-boyfriend, Hugh Hefner, would miss her.

"Would he even miss me? No, I was certain I was just another warm body—as we all were. 'Just another blonde,' I could hear him say," she wrote.

Down the Rabbit Hole: Curious Adventures and Cautionary Tales of a Former Playboy Bunny hits bookshelves on June 23.