Prince Harry "regrets losing Princess Kate" as the Duke of Sussex feels "torn", a royal author has claimed.
The Duke and Duchess of Sussex stepped down from working duties four years ago and subsequently moved to the US.
In recent years, the feud between the Waleses and the Sussexes has persisted, heightened by the publication of Prince Harry's memoir Spare.
The duke and duchess also released a Netflix docuseries titled 'Harry & Meghan', where they spoke at length about their feelings on Prince William and Princess Kate.
Kate and Prince Harry were known for their close friendship
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Royal author Tom Quinn has claimed that Meghan Markle, 42, does not feel guilty about her feud with the Princess of Wales.
He explained: "Meghan doesn’t feel guilty about Kate, because she feels that Kate should’ve been the one person in the Royal Family to back her against every difficulty.
"Apart from anything else, Meghan knew Kate was an outsider, so she just couldn’t understand why Kate always towed the royal line rather than supporting her, Meghan, the other outsider."
Last month, Princess Kate announced she had been undergoing a course of preventative chemotherapy for cancer.
Princess Kate used to have a strong bond with Prince Harry
PAQuinn continued: "Kate’s cancer diagnosis has been a real shock for Meghan, but she can see no way to patch up the relationship simply because it has become so poisonous.
"She also doesn’t want people saying that she is trying to make things up with Kate just because Kate is ill.
"Meghan still feels Kate was in the wrong and should apologise before they try to build bridges."
In the wake of the news that the Princess of Wales has cancer and is undergoing treatment, Meghan and Harry released an official statement which read: "We wish health and healing for Kate and the family, and hope they are able to do so privately and in peace."
Meghan Markle has been distant from Princess Kate in previous years
PAQuinn added: "[Harry] really misses that warm, uncomplicated relationship, and he is torn between loyalty to his wife and regret about the loss of the woman he was so close to.
"Losing Kate was Harry’s second great loss after losing his mother."
Prince Harry revealed details about Kate's feud with Meghan in his memoir Spare.
According to the Duke of Sussex, Kate texted Meghan saying that her daughter Princess Charlotte disliked her bridesmaid dress for the Sussex wedding.
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The Waleses and the Sussexes are not thought to be on speaking terms
GettyThe princess reportedly wrote: "Charlotte’s dress is too big, too long, too baggy.
"She cried when she tried it on a home."
Kate's cool response was understood to have left Meghan "sobbing on the floor".
