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Prince William found something about Princess Diana hard to accept. The Duke of Cambridge is pictured during a visit to Ballymena, Northern Ireland, on Feb. 28, 2019. Jeff J Mitchell-WPA Pool/Getty Images

Both he and Prince Harry have often spoken highly of their late mother and admitted to how much they miss her, but that doesn’t mean Prince William was always supportive of things his mother, Princess Diana, said and did while she was alive.

In a biography on the late Princess of Wales, titled “Diana: The Last Word,” Simone Simmons, who was a close friend of Diana’s, revealed that following Diana’s famous interview where she said there were “three people” in her marriage to Prince Charles, Prince William, who was 13 at the time, became upset and found it hard to accept that his mother had discussed the drama so openly.

“There were times when Prince William found [Diana’s comments] difficult to accept,” Simmons wrote. “He wouldn’t speak to her afterwards and when he came home all hell broke loose. He was furious that she hadn’t told him what she was going to do. Furious that she had spoken badly of his father, furious that she had mentioned [James] Hewitt.”

“He hated the idea of being on television and he knew his friends would poke fun at him, which they did,” she added. “he felt she had made a fool of herself, and him. He was so angry with her. He started shouting and crying and, when she tried to put her arms around him, he shoved her away.”

However, while he didn’t approve of the interview at the time, Prince William did eventually come around, admitting in an interview marking the 20-year anniversary of Princess Diana’s death that as an adult, he understood why she did what she did because it was sometimes easier to address rumors and stories directly instead of just letting things be said without any verification.

“I can understand—having sometimes been in those situations, you feel incredibly desperate and it is very unfair that things are being said that are untrue,” he said at the time. “The easiest thing to do it just to say or go to the media yourself. Open that door [but] once you’ve opened it you can never close it again.”