Lisa Rinna says she was 'too cruel' to Denise Richards

Sept. 16 (UPI) -- Lisa Rinna says she was "too cruel" to her longtime friend and former Real Housewives of Beverly Hills co-star Denise Richards.

The 58-year-old television personality discussed her treatment of Richards during Wednesday's episode of Watch What Happens Live.

Richards left RHOBH after Season 10 following drama with Rinna and her co-stars over her alleged affair with Brandi Glanville.

On WWHL, Rinna played a Yom Kippur-themed game where she answered whether she would like to atone for certain situations. When asked, Rinna said she would like to atone for her behavior toward Richards.

"You know, I don't like my behavior and how I treated her," Rinna said of Richards. "I was mean and ... I was cruel. I was too cruel, I absolutely was, and I would like to atone for that."

Richards said in an interview with Entertainment Tonight in August that she hasn't ruled out a return to RHOBH.

"You know, I really did enjoy working on the show. I hate to even say working on it. I liked being a part of the show, and I had fun with most of the women, not all!" she said.

On WWHL, Rinna was also asked to name the worst thing she said about her daughter Amelia Hamlin's ex-boyfriend Scott Disick behind his back.

"You know, I have actually been quite nice about Scott Disick, and I would never say that out loud... I might have thought some things that weren't very good," Rinna said.

"Listen, I tried really hard," she added. "I was really patient, and I tried really hard. We'll leave it at that."

E! News reported last week that Hamlin, 20, and Disick, 38, had split after 11 months of dating.

Real Housewives of Beverly Hills is in its 11th season on Bravo. The series co-stars Kyle Richards, Erika Jayne, Dorit Kemsley, Garcelle Beauvais, Crystal Kung Minkoff and Sutton Stracke.