Prince William and Duchess Kate have been happily married for nine years and share three children, but there was a time back in 2007 where their relationship hit the rocks and the couple split — with the British royal dumping his longtime girlfriend via a phone call, according to a new book.Royal historian and author Robert Lacey claims in his new book, Battle of Brothers, that the future king, who was 25 at the time, was “uncertain” about his future with his girlfriend of almost six years and