Prince Harry has been left in a “painful place” after writing about Princess Catherine following her shocking cancer diagnosis.

According to a royal expert, the Duke of Sussex is said to be “regretful” after he wrote about the Princess in his memoir ‘Spare’.

Royal expert Tessa Dunlop spoke to Us Weekly about how Prince Harry would be feeling after he wrote about his sisterinlaw.

“When you do discover that your sisterinlaw has cancer and you’ve written stuff that can’t be retracted, that’s quite a painful place to be in. I’m not saying it isn’t,” she said.

Dunlop cautioned Harry and Meghan to be careful about further revelations of their estranged family.

When Spare was released, Princess Catherine was reportedly shocked about what was written about her.

The Princess felt she was being attacked and had no intention of forgiving Harry and Markle for their “public betrayal”, according to the New York Post.