Angela Levin says Prince Harry will be "hurt" by not being at the weekend's remembrance service at the Cenotaph in London, as his father King Charles lead the nation's annual ceremony.
Joined by senior royals Prince William and Princess Anne, the royal family gathered at the monument to pay their respects to those who gave their lives in line of duty, and to mark the end of the First World War.
Also watching on from the balcony was Queen Camilla and Princess Kate, Princess of Wales.
Notably absent from the ceremony, Prince Harry was at his home in Montecito, California with wife Meghan Markle.
Angela Levin said Prince Harry wanting to do the best for his country has 'gone out the window'
GB News
Discussing the Duke's absence from the family appearance, royal biographer Angela Levin told GB News that he would be "nervous and upset" about missing the event.
Levin told Mark Dolan: "He hadn't wanted to come here. He doesn't really want to come until his father and his brother promise to apologise to Meghan."
Levin added: "Actually, one would imagine Meghan should apologise to them, but that's it. And they've come to a sort of end, really, somehow.
"Because King Charles will say the door is open, come when you want to, but Harry doesn't want to come until he gets this."
Analysing Prince Harry's love for the military and his past services, Levin revealed: "As much as he loves the military and he was very happy, he told me that that's where he feels he is himself.
"He loved not all the pomp, he didn't want the pomp and the circumstance. He wasn't interested in celebrity like he is now.
"He wanted to work and do his very best for the country. That's what he said. That's what his aim was, to do the best he could for the country. And that's all gone out the window, I'm afraid."
Mark Dolan reacted to Levin's claim and said the circumstances around Prince Harry and the royal family is "sad".
King Charles lead the remembrance service at the Cenotaph on Sunday
PA
When asked by Mark if the "old" Prince Harry will ever return, Levin said: "Most unlikely, really.
"I think he's changed. His whole being is very different. I wouldn't recognise him. He's very bitter. Very bitter indeed. He was a little bitter when I met him, but he's now full of it.
"I think Meghan is a lot to blame and she's poured into him all the things that are terribly wrong and that she's made him really dislike his own family and his own country.
"Meghan didn't like the UK. She found it too small. And if you'd ever listen to her carefully, she always wanted to talk about global. She wanted her work to be global. She feels to be global and the UK is not grand enough for her."