, it was claimed his behaviour had taken its toll on Cressida.
Author Robert Lacey wrote: "Even so, Cressida Bonas, his last serious girlfriend before Meghan Markle, came to feel he was a damaged and self-obsessed young man.
"'No matter how educated, talented, rich or cool you believe you are,' she posted enigmatically on her Instagram page, 'how you treat people ultimately tells it all.'"
"She complained to friends that Harry had a neurosis about the media. He'd rant and complain about paparazzi lurking where clearly there were none, she said."
Battle of Brothers also claims…
Cressida and Harry split in 2014 - with the model thought to have been overwhelmed by the attention she was getting while engagement rumours swirled around the young couple.
However, the two have remained on good terms, and Cressida attended the prince's wedding with Meghan Markle in 2018.
The claims come after it was reported that Prince William reportedly called in Princess Di’s brother after “brusque” and “peppery reactions” to his own attempts to talk to Harry about the speed of his romance with Meghan.
William is said to have turned to Charles Spencer, 56, — who walked with them and Prince Charles behind Diana’s coffin in 1997 — much to the annoyance of Harry, 36.
But the move angered Harry - who was alleged to have become furious with the future king for dragging other family members into the row.
According to Battle Of The Brothers the tiff led to the brother’s continuing “fraternal fissure”.
Among William's frustrations were claims that Harry and Meghan had given the palace just ten minutes' notice over their announcement to quit the Royal Family.
Wills was distraught when they announced in January they were quitting for a life in Canada.
And while he reportedly agreed to keep things civil at the Sandringham Summit, which hammered out the first details of the Megxit deal, he was unwilling to go any further, according to the book.
Cressida Bonas was Prince Harry's last serious girlfriend before Meghan Credit: Reuters The couple dated for about two years Credit: Getty Images - Getty Prince Harry is now living in the US with wife Meghan Markle Credit: Getty Images Details of a rift between Harry and William have continued to emerge Credit: AFP - Getty Biographer Robert Lacey spoke with 'countless' insiders while writing the book
Prince Harry's ex Cressida Bonas secretly marries Harry Wentworth-Stanley