Prince Charles
Prince Charles' body language showed that he was impatient and annoyed when asked about his marriage. Pictured: Prince Charles visits the new Emergency Service Station at Barnard Castle on Feb. 15, 2018 in Durham, England. Getty Images/Chris Jackson

Prince Charles was not comfortable when he was asked about the breakdown of his marriage with Princess Diana and his affair with Camilla Parker Bowles.

The Prince of Wales' past interview about his marriage with Princess Diana has resurfaced. In the clip, Prince Charles said that he tried to be faithful "until it became irretrievably broken down."

According to Judi James, based on the royal's body language, he was not comfortable about the matter. In fact, there were signs that he was impatient and annoyed at some point.

"When the subject of faithfulness comes up his brows steeple and his eyes roll upward. He brings his hands to neck height and steeples his fingers, tapping the finger tips together," James explained (via Express).

"Steepling is a sign of status and the finger-tip tapping suggests deep impatience and annoyance at having to answer questions about his marriage."

According to James, there were also a few signs of anxiety and guilt. "He then collapses the hands to signal anxiety, either wringing them or scratching his palm to hint at some guilt at the answers he is giving," the body language expert added.

Overall, Prince Charles remained calm in the interview. However, James believed that he had a different state of mind.

"His anxiety, impatience and 'hide' rituals told another story," James said. "At times he even opted for the kind of verbal swerve that we normally associate with politicians who want to avoid answering questions or telling the truth."

In related news, Prince Charles revealed that it was not easy to be a father of two. In a secret letter addressed to a friend named "David," the Prince of Wales admitted that they received a warm greeting and support from the public, but he was still adjusting to the thought that he already had two kids.

"We are thrilled with our new arrival, but can't get used to the idea of being a father of two - it all seems much too grown up somehow!" Prince Charles wrote.

Meanwhile, Camilla and Queen Elizabeth II are both hosting a party for Prince Charles upcoming 70th birthday. There are rumors that the two are competing.

The Queen will reportedly give a reportedly make a speech to honor Prince Charles. Her event would be attended by the British gentry and European royalty. On the other hand, Camilla's party will be a night of "music, opera, ballet and Shakespearean drama."