Kim Kardashian wasn't faithful in a former relationship, at least according to her ex-boyfriend William Ray "Ray J" Norwood.

While participating in Celebrity Big Brother in the U.K. this week, Ray J claimed Kardashian had cheated on him when they dated more than a decade ago, Us Weekly reported.

The R&B singer, 35, made the accusation while chatting with singer Stacy Francis -- who was friends with Ray J's sister Brandy -- on the British reality show.

Francis reportedly said she was at Brandy's house when the 36-year-old Keeping Up with the Kardashians star was styling Ray J's clothes.

"She was really into you, really in love with you," Francis, 47, said of Kardashian.

"Nah, but she was a player though," Ray J insisted.

"She was not a player, she was crying her eyes out for you," argued Francis, who had competed on Season 1 of The X Factor in the U.S.

"You don't really know what happened though. Put it like this, we were both players. We were both cheaters," the former For the Love of Ray J star claimed.

"I don't believe that about her," Francis confessed. "I remember her being very heartbroken over you. I think she really loved you very much."

Kardashian and Ray J began dating in 2003 and were together on and off until 2006. In February 2007, a sex tape the couple had made when they were romantically involved was released by Vivid Entertainment.

A "humiliated" Kardashian sued the company for ownership of the tape, however, she ended up settling for $5 million in April 2007. Keeping Up with the Kardashians then premiered in October of that year, so people have argued the tape is responsible for launching Kardashian's career and bringing her fame and fortune.

Ray J insisted to Francis that she didn't know the whole story when it came to his relationship with Kardashian, whom he genuinely cared about though, according to Us.
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"Every relationship I was in, I loved the girl. It's just the moral values and standards was off. I was loving and lying," Ray J said on Celebrity Big Brother.

Ray J released a popular song "I Hit It First" in 2013, which has been perceived as a jab to Kardashian and her now-husband Kanye West.

Ray J, however, reportedly said he has no hard feelings toward West, nor has he "crossed paths" with Kardashian since their split.