Princess of Wales Kate Middleton is reportedly considering stepping away from her royal duties, according to a bombshell new report. Kate’s rumored decision has reportedly rocked her marriage to king-in-waiting Prince William and the monarchy, the report claimed. While Kate reportedly hasn’t officially decided, the 42-year-old keeps pushing back the date when she’ll return to public life. “Kate’s desperate struggle with the constant pressures of life in the royal fishbowl has clearly taken a terrible toll on her physical and mental health,” a senior palace source told the National Enquirer. “S…