Why Prince Charles reportedly "desperately wanted to get out of the wedding" to Diana.

It’s no secret Princess Diana and Prince Charles‘ relationship was a tumultuous one.

For years, rumours had been circulating from both royal spectators and biographers, including ones where Diana was apparently unwilling to wed Prince Charles.

But now, royal correspondent Robert Jobson has revealed to The Daily Mail that Charles felt the same, meaning doubt over the commencement of their marriage was actually mutual.

Jobson travelled around the world with Charles for 18 months, and is set to release a new royal biography to mark Charles’ 70th birthday.

In the biography, Jobson detailed not only the lack of compatibility shared between the two, but Charles' painful awareness of the fact.

The two reportedly knew nothing about one another due to merely meeting no more than 12 times prior to becoming engaged.

Despite so deeply wanting to, Charles' inability to call off the wedding stemmed from heavy family pressure and a deep-seated feeling of powerlessness.

"I desperately wanted to get out of the wedding in 1981, when during the engagement I discovered just how awful the prospects were," words reportedly said by Charles, according to Jobson.

"I was permanently between the devil and the deep blue sea."

As stated by Jobson, the Prince thought pulling out of the wedding would've been "cataclysmic" at the time, but in hindsight, blamed only himself for ignoring his overwhelming feelings of hesitance.

Jobson also claimed Charles thought Diana had "alarming and irrational mood swings and temper", where she would burst into tears unprovoked.

Prior to these claims, Andrew Morton reported that Diana confided in the journalist and biographer about the difficulties drowning her relationship with Charles.

“I remember crying my heart out on my honeymoon,” Princess Diana is heard saying in tapes replayed for the documentary, Diana: In Her Own Words.

“I threw myself down the stairs. Charles said I was crying wolf, and I said I just felt so desperate, and I was crying my eyes out. And he said, ‘I’m not going to listen, you are always doing this to me, I’m going riding now.’ So I threw myself down the stairs. Bearing in my mind I was carrying a child.”

Robert Jobson's Prince Charles biography is set for publication in November of this year.