Hunter Biden’s ex-wife Kathleen Buhle has written a new memoir in which she revealed how she learned that he was having an affair with the widow of his late brother Beau.

In her memoir “If We Break: A Memoir of Marriage, Addiction, and Healing,” Buhle revealed that she learned about the affair from her daughters after they found out about it from looking at their father’s phone. They were stunned to discover illicit text messages between Hunter and Hallie Biden, Beau’s widow.

Buhle made her way to her therapist Debbie’s house after one of her daughters told her to go there. One daughter was with Debbie and the other was on speakerphone, and they asked the therapist to break the news of the affair to their mother.

“Can you tell her? We can’t do it,” one daughter said to Debbie, according to an excerpt from the book that was obtained by Fox News.

Debbie proceeded to look Buhle in the eye and say, “Hunter’s having an affair with Hallie.”

“If anything, I felt a strange vindication,” Buhle recalled. “Not only had I not been crazy, but it was so much worse than I could have imagined. I was shocked, but not heartbroken. Heartbreak had already flattened my self-esteem that past year.”

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Debbie then told Buhle that they had already called Hunter to let him know that they knew about the affair. She felt even more “relief” that there were “no more secrets.”

Beau died of brain cancer in 2015 at the age of 46. Buhle went on to write that she remembered Hunter and Hallie spending a lot of time together after Beau’s funeral.

She ultimately made Hunter move out after finding a crack pipe in an ashtray, after he’d long claimed to her that he was “healthy and sober.”

Meanwhile, Buhle admitted that she had her “own kind of addiction,” which was following Hunter’s every move through his credit card charges.

“I didn’t want to admit, to myself or anyone else, how unhealthy our relationship had become, so my struggle was just one more secret,” Buhle acknowledged.

When asked about the “Justice Department investigation into his finances and business affairs,” Buhle replied, “Whether or not I’m questioned, I couldn’t be of any help…I kept my head so deeply buried in the sand on our finances.”

“He started many ventures . . . a real estate investment fund and then a technology company,” she explained. “I didn’t understand any of it, or what pieces of his businesses actually generated income for us. I worried that we lived above our means, but I did nothing to change it.”

“The way that Hunter and I handled money was that whenever I needed any, I called Hunter,” she added. “More than once my debit card was declined at a store. I’d have to call Hunter to transfer money into my account. Hunter and I drove nice cars and had a beautiful home, but we were running fast on that hamster wheel and barely staying on.”

After divorcing Hunter in 2017, Buhle was diagnosed with colon cancer, but she is now thankfully four years cancer free. Her memoir is set to be released on June 14.