Rihanna and Chris Brown's relationship is a thing of the past, but Karrueche was forced to live the moments all over again during her sit down with Iyanla Vanzant.

The model and former girlfriend of Chris Brown sat down with Vanzant and revealed the moment she discovered Brown was cheating on her with Rihanna. Kae says she was aware that the two rekindled their friendship but was surprised when Brown became intimate again with the singer.

Kae was a year in her relationship with Brown when Christmas Day in 2012 changed everything, after Brown left Kae at his home in LA and was seen in the front row with Rihanna at a Lakers game later that evening.

"I didn't want to believe it," Karrueche said. "I was under the impression that it was a friend-type of... not a friend, but it wasn't what it became to be." During that time, Brown released a video admitting his faults and claiming that he loved both women.

Since then, Kae has moved on to focus on her business ventures, while Brown has connected with his daughter Royalty.

The full interview will premiere tonight on the OWN Network.

Source: Hollywood Life | Photo Credit: Splash News