Prince Harry rushed to the U.K. to visit King Charles after he was diagnosed with cancer, but sources close to his family saw the trip as a self-centered decision. “The king announcing he had cancer was totally unprecedented and incredibly brave — but suddenly the focus was on what Harry was doing. He seems to have this knack of making it all about him,” the source told an outlet. The insider later noted that since Harry left the U.K., he has publicly trashed his relatives. “Some people think it’s a bit late to cast himself as the dutiful, concerned son after all the unforgivable things he sai…