Has Kim Kardashian been involved in multiple affairs? According to a new tell-all book, the answer is yes. Myla Sinanaj, Kris Humphries’ ex, is threatening to expose Kardashian as a cheater after years of speculation that the Keeping Up with the Kardashians star wasn't faithful to Humphries or Reggie Bush. The most damaging part of the book, some say, could be the fact that Sinanaj is saying Kanye West has good reason to worry.

“I was the one making Kanye keys to her suit at 2 a.m.!!! Back when she was supposed to be with the love of her life Reggie Bush right??” Sinanaj tweeted. “My advice to Kanye is ‘if they cheat with you they cheat on you’ remember that.” And Humphries’ ex plans to further reveal the sordid details behind Kardashian’s infidelity in the shocking tell-all book she has in the works.

Kim Kardashian and Kanye West Kris Humphries ex, Myla Sinanaj, claims that the Kim Kardashian snuck Kanye West into her hotel room while she was dating Reggie Bush and he was seeing Amber Rose.

“It turned out to be a lot more detailed than she’d originally planned, but Myla figured if she’s going to do it why not lay it all out there,” a friend of Sinanaj’s told Radar Online. “She’s going to include all the legal documents, subpoenas that she got from Kim, and even her wedding invitation. For the first time, she’s going to tell the world about the tricks that Kim tried to pull during her divorce.”

Likely to be discussed in the bombshell book is Kardashian’s lengthy affair with West while the two were both otherwise committed. West was dating Amber Rose at the time. The model later claimed the reason for the split was her boyfriend’s romance with Kardashian. “They were both cheating. They were both cheating on me and Reggie with each other,” Rose told Star magazine.

“She was sending pictures, and I was like, ‘Kim, just stop. Don’t be that person,’” Rose revealed. West’s former girlfriend said she even tried to talk some sense into the reality star via email, but her message went unanswered. “I thought at least she’d be woman enough to respond to me. She never responded. It’s very important that us women stick together and we don’t f**k each other over like that,” Rose added.

Kim Kardashian Kanye West's ex Amber Rose revealed that Kim Kardashian sent her boyfriend sexy pictures and text messages despite the fact that they were dating.

While West was reportedly on the other end of her adulterous activity, Sinanaj insists that Kardashian’s fiancé will not be pleased by some of the information she plans to include. “Kim used to bask Kanye all the time back in the day,” a source said. “Kris told Myla that Kim said Kanye smelled ‘down there.’ I guess it’s because he always wears the same clothes all the time!”

The Kardashian tell-all will likely tarnish the sophisticated image Kardashian has been trying to achieve. According to Sinanaj’s friend, the reality star has every reason to be concerned. “Myla has so much dirt on Kim and she’s already gotten interest from some publishers about the book,” the source said. “Kim should be scared!”