For years, everyone thought that Prince Harry had a great relationship with his brother’s wife, the Princess of Wales (formerly known as Kate Middleton). They were all smiles every time they were photographed and always looked like they were having a good time and enjoyed doing royal engagements together.

But in Harry’s memoir Spare and what he has said since stepping down as a working royal, the Duke of Sussex revealed that he and Prince William grew apart and weren’t always as tight as everyone thought.

Now, a royal author is claiming that started after William and Kate tied the knot and the Prince of Wales became all about the Middleton family, which baffled Harry.

Author says Prince Harry ‘mourned’ the loss of his bond with William after he married Kate

Tina Brown is the former editor-in-chief of Vanity Fair and The New Yorker as well as the founder of The Daily Beast and Talk Magazine. She was also one of the late Princess Diana’s confidants.

In her book The Palace Papers: Inside the House of Windsor, the Truth and the Turmoil, Brown spoke with some staffers who worked at the Palace and witnessed the shift in William and Harry’s relationship after the older prince and Kate said “I do.”

“Though they were still incredibly close, living next door to each other [at Kensington Palace], sharing the same office, and hanging out an awful lot, Harry mourned his us-against-the-world bond with William,” Brown wrote per Express.

The Duke of Sussex thought the ‘bougie’ Middletons were ‘boring’

Brown also discussed what she heard from Palace insiders about Harry’s feelings towards his brother’s in-law’s who William loved spending time with.

According to Brown’s book, “Harry felt displaced by their bougie family unit, and couldn’t understand his brother’s obsession with his Middleton in-laws, whose Bucklebury world bored Harry to tears. They had become a tight unit, and William a full-on Windsor country bumpkin.

“On weekends when he wasn’t chez Middleton, he was tramping the grounds of Anmer Hall, the red-brick Georgian mansion on the Sandringham Estate that the queen gave the couple as a wedding present, wearing a flat cap and tweed jacket like his ‘turnip toff’ Norfolk farmer friends.”

Managing Editor of Majesty Magazine, Joe Little, elaborated on that and discussed how even though he was a royal, William was able to fit in with the Middletons and got along so well with them even before marrying Kate.

“William [fit] into the Middleton family very quickly, and they took to him as a future son-in-law,” Little said. “I think also a bit of stability and grounding and a bit of normality that William perhaps wasn’t too familiar with when growing up because clearly his parents’ marriage was facing difficulties when he was a child and he was very aware of that and eventually their marriage disintegrated. With the Middletons, he got stability and a bit of normality, so for that William will forever be grateful.”