Royal author Tom Quinn revealed insights into Kate Middleton and Prince William's relationship.

Quinn claims the couple has "terrible rows" where they throw things at each other.

William's signs of annoyance towards Kate include calling her "darling."

Kate is often seen as the calm one in their relationship, while William is hot-headed.

Palace aides add to the couple's stress.

Quinn compares their situation to a Jane Austen novel.

Kate is an appeaser by instinct, and William gives way due to his past emotional turmoil.

The couple's private moments should be respected.

Like all couples, William and Kate have disagreements but eventually make up.