Prince William and Kate Middleton have their ups and downs like any other relationship. It began in 2007 when the couple reportedly split up for various reasons, which led to the two going their own way for a while – William’s behavior apparently left Kate heartbroken. But, in the end, the two made amends and continued together.Today, 13 years after getting married in a lovely ceremony at Westminster Abbey, William and Kate have a beautiful family with three children. However, there are always challenges to a marriage, and despite many believing that nothing could be wrong with a future king-and-queen couple, that is not the case.According to a royal expert, the Prince and Princess of Wales have struggled with their marriage. As it stands, it’s not as perfect as one might think.