Kim Kardashian's engagement high may soon be coming to an end after some of her darkest secrets could be soon revealed by Kris Humphries' ex-girlfriend, Myla Sinanaj. 

According to RadarOnline.com, Sinanaj has begun writing a tell-all book about Kardashian that highlights her relationships with Humphries, fiancee Kanye West and ex-boyfriend Reggie Bush. 

Sinanaj first wanted to expose Kardashian's secrets when she was dating Humphries after he talked badly about the 33-year-old reality star. She claimed that Kardashian is a cheater who would often sneak West in her hotel when she was dating Bush. 

"The last year and a half have been so insane and Myla really wants the truth of what happened to be out there," the source said. "She's been wanting to do this for a long time."

Sinanaj has been a little busy lately, after getting plastic surgery five weeks ago, but now has time to focus on her new project. 

"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," says her friend. "People deserve to know the truth about Kim."

"Myla's telling everything," the source revealed. "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."

Sinanaj also claimed that Kardashian used to talk badly about West and his odor. 

"Kim used to bash Kanye all the time back in the day," the 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!"

Tags: Kim Kardashian Kanye West Kris Humphries myla sinanaj Reggie Bush