Kate Middleton has confronted Prince William several times about his infidelities. According to Tom Quinn, they have even thrown things at each other during the heated discussions that were caused by William’s affair with Rose Hanbury, who used to be Kate’s best friend.
The British author is close to the family and in his recently published book, Gilded Youth: An Intimate History of Growing Up in the Royal Family,  he revealed in extreme detail what was the aftermath of the scandal like between the beloved couple. In 2019, a set of photos was leaked online and revealed that William had an extramarital affair with Hanbury.
It’s not all sweetness, they have terrible fights where they throw things at each other. Kate can seem like a very calm person, and so can William. But it’s not always true. Because the big stress for William and Kate is that they are constantly surrounded by palace aides. It’s like a Jane Austen novel
Earlier this week, it was reported that Kate is traveling with her children to celebrate the birthday of her niece and that she is probably not going to attend any royal event in the upcoming days because she wants to stay away from William as much as she can.