Princess Diana’s fairy-tale marriage to the then-Prince Charles turned sour as the years went on, with the late royal often trying to confide in her mother-in-law, Queen Elizabeth II, for help.

Diana — who died in a car crash in 1997 — married (now King) Charles, 75, in a lavish ceremony in 1981 and they divorced in 1996.

“My Mother and I” author Ingrid Seward recently claimed that the Princess of Wales would lament about her failing marriage to the queen; however, the monarch allegedly didn’t do much to help.

4
Charles and Diana married in a lavish ceremony in 1981. Tim Graham Photo Library via Getty Images

“Diana used to go to her private room in between appointments that the queen had, which were every 20 minutes, and burst into tears,” Seward told Fox News recently.

“[She would say], ‘Everybody hates me, mama, and I hate my husband. He’s a nightmare.’”

“The queen would just stand there [horrified], and Diana would be getting more and more hysterical,” the royal expert continued.

The sovereign reportedly “didn’t know how to handle it, but she thought Charles should know how to handle it. That was a very low point in the relationship.”

4
Diana often tried to confide in her mother-in-law about her marriage troubles. Tim Graham Photo Library via Getty Images
The marriage was marred with difficulties, as Charles and Diana were seemingly incompatible. Charles was 13 years older than Diana, who was just 20 years old when they tied the knot.

He also embarked on a decades-long on-again/off-again affair with Camilla Parker-Bowles, whom he married in 2005.

“[Queen Elizabeth] couldn’t understand how her son, who was in his early 30s, couldn’t handle a woman who was only in her early 20s. And she didn’t understand because she didn’t have the experience to understand something like that,” Seward explained.

4

The Princess of Wales died in 1997 at the age of 36. Princess Diana Archive
She then noted that Charles and Diana’s doomed marriage failed because both parties were “immature” and they were “unsuited” for each other.

Seward revealed what Diana had once told her about her ill-fated relationship.

“Diana said many, many, many years later to me, ‘If only we’d met at a different time in our lives,’” the expert claimed. “She had a fixed idea in her mind of what she thought Charles was, and he wasn’t at all.”

4
Both Diana and Andrew stayed friends throughout the course of their lives. Getty Images
The pair welcomed two sons after their wedding, Prince William, 41, and Prince Harry, 39.

In her book, “My Mother and I,” Seward claimed that the queen wanted Diana to wed her younger son, Prince Andrew.

The Duke of York, 64, was closer to Diana’s age, as they were both born in the early 1960s.

Andrew wound up tying the knot with Diana’s friend, Sarah Ferguson, in 1986 and they split in 1996.

“I think they always used to get on very well, and they laughed a lot together,” Seward said. “I’m sure Andrew thought she was wonderful, but she probably wasn’t his type really. He always liked quite sophisticated women, and I don’t think Diana would’ve put up with him. But I think they got along very well as friends.”