Yolanda Foster and David Foster Credit: Dimitrios Kambouris/Getty Images

“I spend most of my days in bed,” Yolanda Foster told Us Weekly of coping with chronic Lyme disease at the December 3 sixth-season premiere party for The Real Housewives of Beverly Hills held in Hollywood. “I’ve been in bed for exactly a year.”

But her ex-husband David Foster is skeptical. “David and his family think Yolanda just loves the attention of being sick,” a friend of the 66-year-old songwriter reveals in the new issue of Us Weekly. “They believe she’s exaggerating her condition. And they point out that she’s never gotten a legit diagnosis or a second or third opinion.”

A second insider adds that David questioned his ex’s motives. “He didn’t understand why Yolanda wouldn’t leave The Real Housewives of Beverly Hills if she’s in so much pain and so tired,” says the source. “He’s famous and private and rich, so it was frustrating Yolanda wanted to do this show so badly.” The source adds that David shelled out nearly $5 million on Yolanda’s treatments.

While the reality star, 51, is publicly documenting her health battle on the hit Bravo show, an insider close to the mom of Gigi, 20, Bella, 19, and Anwar Hadid, 16, says it’s no PR stunt. “The sickness is very real and not fake,” says the pal. “She’s being brave, and she’s a fighter. She did this season only to promote awareness of the disease.”

As previously reported by Us, the couple’s relationship started to sour when the former model became ill a year after their 2011 nuptials. The famed music producer wasn’t able to stay by her side all the time, “and she needed someone,” a source told Us.

The pair announced their split on December 1. “We’ve shared nine beautiful and joyous years together,” they told Us in a statement. “During that time we experienced love, friendship and the inevitable challenges that come with managing a marriage, careers, blended families and health issues.”

Want stories like these delivered straight to your inbox? Sign up now for the Us Weekly newsletter!