Prince Harry and Meghan Markle were unaware of Kate Middleton’s cancer diagnosis until it made global headlines, causing a rift within the royal family, RadarOnline.com has learned. The Duke and Duchess of Sussex were reportedly caught off guard by the news, learning about Middleton’s health battle on the same day it became public knowledge. “This goes to show the irreparable damage they have caused,” an inside source told the New York Post. “The trust has been broken and the royal family is OK distancing themselves from them.” The revelation of Middleton’s health struggle came just as Prince …