• Prince Harry and Meghan Markle have not released a statement addressing the allegations about them in Tom Bower's new book "Revenge"
  • Historian and royal expert Gareth Russell believes the couple will stay silent on the book's claims
  • Russell said it won't "do anyone good" to always respond to rumors 

Prince Harry and Meghan Markle have not responded to the new allegations made about them in a new royal biography, and a royal expert has suggested that they likely never will.

British author and investigative journalist Tom Bower made bombshell claims about the Duke and Duchess of Sussex in his newly released book, "Revenge: Meghan, Harry and the War Between the Windsors."

But historian Gareth Russell, author of "Do Let's Have Another Drink," told Us Weekly Tuesday that Markle and Prince Harry "can't respond" to all the rumors and claims being made about them.

"If you go out answering every single book or allegation, it will consume your entire day. You won’t have spare time to devote to your own mental health and your own well-being," Russell explained.

Among the claims Bower made in his book was that Prince Harry and Markle were allegedly "shackled" before their 2020 royal exit and often "scoured the internet to read the newspaper reports and the trolls' postings on social media."

The former BBC journalist also alleged in the biography that the Sussexes clashed with Victoria and David Beckham. Markle allegedly suspected the fashion designer of "indiscretion," and Prince Harry confronted David with the accusation, damaging their friendship, according to Bower.

"Revenge" also contradicted Markle's previous statement that her sister-in-law Kate Middleton made her cry during a disagreement over flower girl dresses before the former actress' wedding to Prince Harry in 2018. Instead, Bower claimed in his book that Middleton "burst into tears" during a dress fitting after Markle compared her daughter Princess Charlotte "unfavorably" to Markle's best friend Jessica Mulroney's daughter.

Despite this, Russell thinks the couple will stay silent on the book.

"When you are as famous as the Duke and Duchess of Sussex, there is going to be a lot of speculation," the royal expert told Us Weekly. "It doesn’t always do anyone good in public life to always be answering and rebutting those claims."

The "Emperors" author added that he believes the royal couple will go down in history as the ones who upended the royals' famous mantra, "Never complain, never explain." The phrase was popularized by Queen Elizabeth II's late mother, Queen Elizabeth, who was also known as the Queen Mother.

"I think Harry and Megan will probably be remembered as the people who bury that attitude for themselves and for future generations of the royals," Russell said. "And that, maybe, is no bad thing."

Russell's upcoming book on the Queen Mother, "Do Let's Have Another Drink: The Dry Wit and Fizzy Life of Queen Elizabeth the Queen Mother," will hit shelves on Nov. 1.

Prince Harry (R) and Meghan Markle (L), the Duke and Duchess of Sussex, attend the UN General Assembly on Nelson Mandela International Day
Prince Harry (R) and Meghan Markle (L), the Duke and Duchess of Sussex, attend the UN General Assembly on Nelson Mandela International Day AFP / TIMOTHY A. CLARY