Prince Harry and Meghan Markle began to highlight their feud with the royals in their previous projects, but Kate Middleton’s cancer battle could put a pin in any future tell-alls. “It also remains the case that, although it would be unthinkable for the Sussexes to resume their attacks whilst both King Charles and Catherine are seriously ill, there is always the possibility that they might in the future,” Richard Fitzwilliams told an outlet. “The biggest casualty was trust. It is unsurprising that King Charles and Prince William no longer trust Harry and Meghan.” “What, for example, was in the…