Yolanda Hadid speaks candidly about her struggles with Lyme disease and the impact the illness had on her marriage to David Foster in her new memoir, Believe Me: My Battle With the Invisibility of Lyme Disease.

According to a new report, Hadid opens up about the moment she realized that her marriage to Foster was in jeopardy. 

“I’m starting to feel that David is unhappy with the fact that I can’t be by his side the way that I used to be,” she wrote in her memoir, according to an August 25 report by All About The Real Housewives. “I try to make light of it and joke that he married a lemon. It’s sad but true. I went from being the funny girlfriend who was up for anything and had endless energy to the wife who is too sick to be by his side.”

“He lost his wingman, his partner in crime, and I feel as if he’s starting to get impatient with my recovery. I understand that even brief periods of illness can strain important relationships in your life. A chronic condition like mine, one that has consumed years of our lives, poses enormous challenges,” she continued. 

Hadid and Foster announced their plans for divorce in December 2015, just four years after the couple tied the knot. Still, Hadid doesn't hold any ill will towards their marriage and feels their divorce was the best thing for them both. 

“I had a great seven year run with him, and I will always hold that I high regards and have gratitude for that time together,” she said. “If he didn’t leave the marriage I would not be where I am today.”

Hadid's memoir, Believe Me: My Battle With the Invisibility of Lyme Disease, hits stores next month.

To hear what Yolanda Hadid had to say about her split from David Foster just months after their breakup, check out her interview with Andy Cohen on Watch What Happens Live in the video below.