Why was Princess Diana in 'despair' at Prince Andrew's 21st birthday party? Reason

Princess Diana 'was in despair' at Prince Andrew’s 21st birthday party as her fiancee the now-king Charles neglected her, claimed by royal biographer Ingrid Seward in his latest book.

Daily Mail published an excerpt from the new book named My Mother And I on Sunday that stated, "a month to go until she married the heir to the throne" Diana attended Andrew’s birthday bash at Windsor Castle hoping to dance with then-Prince Charles.

However Charles now 75 years old, "spent the entire evening dutifully working the room and making sure he apple with as many people as possible."

Seward then penned in his book that "Diana was in despair, Her fiancee had been away in America for most of the previous week, yet he clearly had no desire to dance with her."

The excerpt continued, "Feeling emotionally drained, she threw herself into dancing frantically with one man after another – and finally just dancing by herself."

In addition to Princess Diana’s mixed emotions including distress and anger, she decided to call off the marriage.

The royal biographer then added that Diana headed to her father’s home in Northamptonshire at 5:30 a.m. after the party in a state of "distraught, flustered, angry and had no intention of ever going back."

He went on to make a bold claim that, "as far as Diana was concerned, the Royal Wedding was off."

However, upon hearing the situation from her daughter, Earl Spencer was "appalled" and after calming Princess Diana down he pointed out, "It would be an act of gross discourtery to break off her engagement to the future king so close to the wedding."

My Mother And I, released on February 15, revolves around the story of King Charles and his mother, the late Queen Elizabeth.