January 6, 2023 | 2:03pm

Prince William is simultaneously furious and bereft amid the barrage of allegations that person emerged from Prince Harry’s upcoming memoir, “Spare.”

Royal adept Katie Nicholl tells Page Six that, per her sources, “William’s privately seething and devastated by what Harry has done. And conscionable cannot forgive Harry for the things that he’s written.”

In the eagerly awaited memoir, the California-based royal writes that his member physically attacked him portion quarreling implicit Harry’s wife, Meghan Markle.

Prince William.Prince William is said to beryllium reeling from the revelations spilled successful Prince Harry’s book.Getty Images

“It each happened truthful fast. So precise fast. He grabbed maine by the collar, ripping my necklace, and helium knocked maine to the floor,” the 38-year-old writes.

“I landed connected the dog’s bowl, which cracked nether my back, the pieces cutting into me. I laic determination for a moment, dazed, past got to my feet and told him to get out.”

Harry claimed that the onslaught near him with a disposable backmost injury.

The renegade royal further disparages his brother. He accuses him of being jealous over him coming up with the Invictus Games, not being supportive of his narration with the “Suits” alum and even takes a jab astatine William’s receding hairline, calling it “alarming.”

Nicholls — writer of “The New Royals: Queen Elizabeth’s Legacy and the Future of the Crown” — says the royal household “were bracing themselves for thing raw, thing explosive” but possibly weren’t acceptable for the volley of attacks lobbed their way.

Prince William.Harry adjacent takes a jab astatine his brother’s hairline successful “Spare.”Getty Images

“They’ve been taken aback by the level of item and conscionable however acold Harry has gone successful each of this,” Nicholls added.

The royal scribe shares that contempt Harry’s desire to hole things with his father, King Charles III, and his brother, she doesn’t spot a reconciliation connected the horizon.

Prince Harry, Duke of Sussex, and Meghan, Duchess of Sussex get  connected  the agelong  Walk astatine  Windsor Castle get  to presumption    flowers and tributes to HM Queen Elizabeth connected  September 10, 2022 successful  Windsor, England.Harry claims that William was not supportive of his narration with Meghan Markle.Getty Images

“The thought that helium wants his begetter and his member backmost conscionable seems truthful incongruous with however helium is behaving and what he’s saying,” Nicholls explained.

“To overgarment specified an unflattering representation of the royal household and a precise unsavory broadside of his member and an uncaring broadside of his father…,” she continued.

“It conscionable does not look to beryllium the actions of a antheral trying to reconcile with his estranged family. It truly feels similar a enactment has been crossed.”

Spare” hits bookstores connected Jan. 10.