Prince Charles’ decision to ask for Princess Diana’s hand in marriage might have been wrong from the start.

In the book “The Firm,” royal author Penny Junor said that Prince Charles and Princess Diana knew each other briefly before they tied the knot in 1981. Since they lacked the foundation of a friendship, the heir to the throne soon learned that the things he thought Princess Diana loved were actually things that she hated.

Prince Charles struggled to understand the changes that he saw in Princess Diana. He also blamed himself in some way, but he refused to share his worries and problems with his friends.

Even though there was always the option to not push through with the wedding, the dad of two didn’t want to cancel it due to the humiliation that they would be receiving.

“But in retrospect, it would have been infinitely less painful and less damaging to everyone involved, including the monarchy, than going through with a wedding that he knew was a mistake. At the very least, he should have discussed it,” Junor said.

A source close to Prince Charles echoed Junor’s sentiments by saying that Prince Charles should have spoken to other people about his relationship with Princess Diana because he has to take into account the constitutional and the private side of things.

Prince Charles didn’t think about the possible consequences that they would both face if their marriage didn’t last. And true enough, their union ended after 11 years.

“Why did Charles allow himself to make what, but he time he walked up the aisle, he knew was the wrong decision? He took advice before he proposed, but once he had asked Diana to marry him, the subject was no longer open for discussion. [Friends] tackled the Prince on several occasions, but were firmly told to mind their own business,” Junor said.

Prince Charles and Princess Diana
Princess Diana and Prince Charles attend a welcome ceremony in Toronto at the beginning of their Canadian tour on Oct. 1, 1991. Getty Images/Jayne Fincher