Diana’s brother’s bombshell: what Charles told her the day before the wedding

Charles Spencer, Princess Diana’s brother, has revisited his sister’s marriage to the then-Prince Charles, revealing details about the doubts she had before their wedding.

Spencer spoke about her much-discussed 1981 marriage to Charles during an interview on “CBS Mornings” on September 28.

Speaking with journalist Gayle King, Spencer said Diana was “in love” with Charles and that this feeling made her brush aside the doubts she had about the marriage.

Spencer also recalled a conversation Diana had told him she had with Charles just one day before the wedding. According to him, Prince Charles had told her: “I’m not in love with you, but I’ll marry you anyway.”

Diana had even shared her concerns with her father, which prompted Gayle King to ask Spencer: “So why did she decide to go ahead with the wedding?”

“I, as the younger brother, felt very reassured,” Spencer said. “When I spoke with Diana before the wedding, during the engagement, she was clearly, genuinely in love with Prince Charles.”

Spencer, who was only 17 at the time of his sister’s wedding, added that Diana had “no romantic experience at all” and that the relationship with Charles was “her first great love.”

According to him, the gravity of the situation, the reality of marriage and Diana’s young age made the decision even more complicated.

In the end, Spencer believes it was Diana’s romantic side that dominated her decision to go ahead with the wedding.

“I think Diana was very much a person of the heart… She was led by her heart and was truly a person unto herself. Maybe she thought everything would turn out fine,” he said.

Spencer’s comments come after he spoke exclusively to PEOPLE this month about his new book, “Swan Song: Diana, My Sister,” dedicated to his sister.

The book contains several bombshell claims, among them that Charles looked “extremely cheerful” during a phone call a few hours after Diana’s death. Spencer also writes that Diana had claimed her husband was “in love with his personal servant.”

After the Daily Mail published a preview excerpt of the book, a Buckingham Palace spokesperson said the palace does not comment on books as a matter of principle, but added that the King is aware that the grief of losing a family member can affect reasoning, judgment and the way events are remembered, even many years after such a loss.

Although Spencer’s accounts of Diana’s life and death have been questioned, particularly by Buckingham Palace, he insists he has put objectivity above everything else in his book.

“Part of my job, since I am a historian, is to present the facts and that is what I am doing,” Spencer said. “There is no malice. I am not angry, or bitter or anything like that. It’s just a straightforward fact and I think it’s important that people know.”