By Ryan Fahey There is one reason that Sarah Ferguson will not remarry Prince Andrew, according to a royal expert. The pair – who were married for 10 years between 1986 and 1996 – won’t revisit their royal romance because it would risk complicating their current relationship, claims Royal author Victoria Arbiter – and dismissed long-standing rumours that the Duke and Duchess of York may one day tie the knot again. On February 19, 1986, which is Andrew’s birthday, the prince proposed to Fergie at Floors Castle in the Scottish Borders. They got hitched weeks later in a lavish ceremony at Westmin…