Seeing William and Kate's happiness was difficult for Prince Harry, apparently

He was lonely, writes Tom Bower. LONDON, ENGLAND - DECEMBER 19: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge and Prince Harry attends a Christmas party for volunteers at The Mix youth service on December 19, 2016 in London, England. The Mix youth service works with Their Royal Highnesses' Heads Together Campaign. (Photo by Danny Martindale/WireImage) In Tom Bower’s controversial new biography, Revenge: Meghan, Harry and the war between the Windsors, the author sets the sc...