Prince Harry Couldn't Hide 'Impatience, Self-Destruction' During Platinum Jubilee, Royal Biographer Claims

Prince Harry and Meghan Markle left the U.K. quietly, but a royal biographer believed it would have been better if they stayed longer.

Angela Levin, author of "Harry: A Biography of a Prince," weighed in on the Duke and Duchess of Sussex's presence at the Queen's Platinum Jubilee. In her opinion, Prince Harry and Markle should have stayed for a couple more days after the finale to bond with the members of the royal family.

"They should have stayed for a few days afterwards, spent time with the Queen after her duties had finished, tried to make things right with William," Levin told MailOnline. "They would have had the time - but they chose to rush in and rush out." She also suggested that Harry appeared to have "lost all respect for anybody now. All his impatience and self-destruction [are] visible. He can't hide it.'"

The Cambridges and Sussexes both attended the National Service of Thanksgiving in honor of Queen Elizabeth. But there was no interaction between them.

Prince Harry and Markle attempted to extend an olive branch to Prince William and Kate Middleton by inviting them to their daughter Lilibet's first birthday at their home, Frogmore Cottage, in Windsor Saturday.

However, the Duke and Duchess of Cambridge were forced to decline as they were set to visit Cardiff Castle in Wales as part of Queen Elizabeth's Platinum Jubilee. The future king and queen went to Wales with their children, Prince George, 8, and Princess Charlotte, 7.

"Things are still fraught — William is still wary of spending any time alone with Harry as you never quite know what may be reported back afterward," one U.K.-based insider told Page Six about Prince Charles' two sons.

Although Prince William and Middleton skipped Lilibet's birthday, they greeted her on social media. "Wishing a very happy birthday to Lilibet, turning one today!" they tweeted.

Levine also commented on the report about Prince Harry and Markle allegedly planning to invite their photographer to capture the Queen's first meeting with their daughter at Windsor. However, the 96-year-old monarch reportedly declined the idea of her first meeting with her great-granddaughter named after her being photographed because it was a private moment.

"It is an incredible cheek. It is too incredible for words to have put pressure on his grandmother when she's struggling to move during four days of celebrations where huge demands are being put on her," Levin said. "It's even more of a strain when you are 96-years-old. The Jubilee is her last effort as monarch, and yet Harry asks for time with her when she can't say no'."

Prince Harry and Markle are already in California. They quietly left on board a private jet. Royal expert Tom Quinn, author of "Kensington Palace: An Intimate Memoir from Queen Mary to Meghan Markle," called out the couple for being "enormously hypocritical" because they are known advocates for climate change, but they boarded a "Russian oligarch kind of jet" estimated to have emitted 60 tons of carbon dioxide during their trip from Farnborough, England, to Santa Barbara.