Ray J just can't stop bringing up the past — meaning his relationship with Kim Kardashian.

The R&B singer, who's currently slated to appear on Celebrity Big Brother, has now claimed his ex cheated on him when they dated more than 10 years ago.

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He accused Kim of being unfaithful while having a discussion with costar Stacy Francis. Stacy, who happened to be friends with Ray's sister Brandy, recalled his relationship with the brunette beauty.

"She was really into you, really in love with you," she told Ray, to which he responded, "Nah, but she was a player though."

kim kardashian ray j getty images

Ray J and Kim Kardashian in 2006.

Stacy continued to defend the mother-of-two, until Ray finally insisted, "You don't really know what happened though," Ray J continued. "Put it like this, we were both players. We were both cheaters."

His costar refused to believe his claim, adding Kim was "very much" in love with the 35-year-old.

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Kim and Ray started dating after the reality star worked as a stylist for his sister. They were on-and-off for three years, and the couple made headlines in 2007 after their infamous sex tape was released, titled, Kim K: Superstar.

The crooner has since slammed the reality star over the tape, and claimed Kim only used him for fame. Following the 2013 release of Ray's "I Hit It First," which was also a dig towards Kim's husband Kanye West, he debuted another diss track titled, "Famous." Sound familiar?

He's also discussed the tape on Celebrity Big Brother, “You might know me for a lot of things — music, reality TV, oh, and you might also know me for my d–k,” he explained. “People wanna know about the sex tape with me and Kim Kardashian. Order it, put some money in my pocket. Y’all still j–king off to the sex tape? Enjoy!”