Princess Diana
Princess Diana looks towards the centre court as she sits in the royal box at Wimbledon waiting to watch the men's singles semifinal between Jimmy Conners and Kevin Curren July 5,1985.Reuters

The transcripts of Princess Diana's secret tapes shed more light on her relationship with Prince Charles after marriage, her depression and the time when she tried to slash her wrists.

Diana recorded her thoughts on a tape in 1991 and sent it to Andrew Morton. Morton wrote a book – Diana: Her True Story – and released it in 1992. More than 20 years later, the book is republished with the transcripts of Diana's tape.

Also Read: Princess Diana's secret recording reveals Prince Charles' 'a bit chubby' comment and affair with Camilla triggered bulimia

The late Princess of Wales talked about her fairytale wedding with Charles on July 29, 1981. She said her life became a misery after marriage when she lived in Balmoral.

"We stayed up there (at Balmoral) from August to October. I got terribly, terribly thin. People started commenting: 'Your bones are showing.' By October, I was in a very bad way. I was so depressed, and I was trying to cut my wrists with razor blades. It rained and rained and rained," she said in the tapes, according to Daily Mail.

Watch Andrew Morton talking about Princess Diana's shocking revelations below: 

"I came down early (to London) to seek treatment, not because I hated Balmoral, but because I was in such a bad way."

She also revealed that on the day of her wedding she kept looking for Camilla Parker Bowles, with whom Charles had an affair. Diana said she was obsessed with Camilla and would constantly think of her.

Princess Diana
Lady Diana, Princess of Wales and Charles, Prince of Wales are seen during their wedding at St Paul Cathedral in London 29 July 1981.AFP/Getty Images

"I was obsessed by Camilla totally. I didn't trust (Charles) — thought every five minutes he was ringing her up, asking how to handle his marriage."

The late Princess then talked about being the third person in the room even though she was with the royal family after marriage. She always thought it would be the wife first for Charles, but it wasn't to be.

Princess Diana
Lady Diana Spencer, the fiance of Prince Charles, holding a baby as she greets the crowds of onlookers, during the opening of the Mountbatten Exhibition at Broadlands, Romsey, Hampshire, May 9 1981.Graham Turner/Keystone/Getty Images

"He was in awe of his Mama, intimidated by his father, and I was always the third person in the room. It was never: 'Darling, would you like a drink?' It was always: 'Mummy, would you like a drink?' 'Granny, would you like a drink?' 'Diana, would you like a drink?'"

"Fine, no problem. But I had to be told that that was normal because I always thought it was the wife first — stupid thought!"

Charles and Diana, Prince and Princess of Wales
Princess Diana and Prince Charles on a walk to the California Pavilion in Vancouver May 6, 1986.Reuters