Rihanna on Chris Brown: 'I Lost My Best Friend, Who's Going to Help Him?' on Oprah's Next Chapter

Rihanna sat down with Oprah Winfrey in her home country, Barbados, and had a real heart-to-heart conversation about what she went through that fateful night in 2009 when her then boyfriend, Chris Brown, infamously assaulted her.

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The episode, which is set to air Sunday on OWN this Sunday, Rihanna addresses her feelings that painful night.

"I lost my best friend. Everything I knew switched ... switched in a night and I couldn't control that," she says in a clip from "Oprah's Next Chapter." "So I had to deal with that, and that's not easy for me to understand or interpret. It's not easy to interpret on camera - not with the world watching. So it was hard for me to even pay attention to my mind and figuring things out because now it became a circus."

In the midst of all the media attention the couple was getting and the fallout from the assault, Rihanna said she was most concerned about Brown's emotional state and whether he would get the help he needed.

"I felt protective," she admits. "I felt like, 'The only person they hate right now is him. It was a weird, confusing space to be in. Because as angry as I was, as angry and hurt and betrayed, I just felt like he made that mistake because he needed help, and who's going to help him? Nobody's going to say he needs help. Everybody's going to say he's a monster without looking at the source, and I was more concerned about him."

In the preview clip, Oprah said: "I went there with my own ideas about who she was from watching her videos and listening to her music.I thought she was gonna be kind of a badass, a kind of hard edged, rocker, pop woman. Nothing could have been farther from the truth."

Over clips of the interview and footage of Rihanna driving Oprah to visit her old neighborhood, Oprah said: "She was thoughtful... She was very emotional... She was vulnerable."

In another segment, Rihanna admits that she is "super duper terrified of the pedestal that comes with fame."

Brown ultimately pled guilty to felony assault for the 2009 beating and was sentenced to 5 years probation and was ordered to stay away from the singer. The restraining order has since been lifted.

Watch the preview of Rihanna's interview on Oprah's Next Chapter below: