Even though he had ended his relationship with former girlfriend Camilla Parker Bowles as soon as he decided to get engaged to Diana in February 1981, the young princess-to-be needed more reassurance, The Duchess: The Untold Story, by Penny Junor claims.

In the newest excerpt of the book posted on the Daily Mail on Monday, Junor unveils a catalogue of mistakes in the marriage that rocked the British monarchy in the ’90s. The new revelations come ahead of Camilla, Duchess of Cornwall’s 70th birthday next month and just before many of Diana’s fans around the world mark the 20th anniversary of her death in August.

According to the book, Diana resented Charles for sitting for hours painting watercolors during their honeymoon onboard the HMS Britannia, so one day she destroyed his painting and his equipment.

On another occasion, Junor claims the royal couple were consulting their schedules when a photograph of Camilla fell out of Charles’ diary. Later, Diana noticed the prince was wearing a pair of gold cufflinks engraved with interwoven Cs — which she took to mean Charles and Camilla.

Princess Diana and Prince Charles in 1981

“It’s hard to believe that anyone as intelligent and well-read as the Prince of Wales could be so stupid — so utterly incapable of imagining what a new wife might conclude if her husband carried a photograph of his old girlfriend in his diary,” Junor says of the cufflink incident, according to the new except.

Princess Diana and Prince Charles in 1992

Diana started suffering from bulimia during the engagement and it continued in the early days of the marriage. Charles “was way out of his depth . . . had no idea how to treat a wife, let alone one who was secretly making herself sick several times a day,” Junor says.

Source: www.people.com