In a new tell-all book reality star Ray J is revealing new details about his infamous relationship with Kim Kardashian. In Death of Cheating Man, Ray J claims that he and Kardashian (who he not-so-covertly calls ‘KK’) began a sexual relationship while Kardashian was involved with her first husband. Huffington Post reports:

We bet Kim Kardashian regrets she ever dated Ray J.

First her sex tape with the singer leaked, and now he’s cashing in on their former relationship with a tell-all book — hinting that she cheated on her first husband, Damon Thomas, with him.

In “Death of a Cheating Man: What Every Woman Must Know About Men Who Stray,” the 31-year-old musician isn’t exactly covert when he refers to an ex-girlfriend he dated for two years as “KK.” The initials match Kardashian’s, as does the time frame of their relationship.

According to Life & Style, Ray J writes in the book, ”[KK] let me know she wanted to get with me. She left her husband for me as soon as we started having sex.”

Click here to read more.