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In 2007, after four years of dating and four years before their 2011 wedding, the royal couple hit a rough patch and decided to break it off.
Clarence House, William’s official residence at the time, declined to comment about the break up, saying it did not comment on the prince’s private life.
So what caused one of our favourite couples to split? At the time they were in a long-distance relationship, with Kate living in London and William in Dorset at army barracks.
According to the book Kate: A Biography by Marcia Moody, it was a family holiday gone wrong that led to the time apart.
Kate's family invited William to come and stay with them in Scotland for Christmas. William had initially intended to come but then changed his mind, upsetting Kate.
William spent Christmas at Sandringham with the Queen and the rest of his family - a strict royal tradition. Kate was not allowed to join in the royal family traditions unless she and William were married (although the Queen made an exception to this rule for Meghan Markle last year).
The trend of spending time apart continued into the new year, as William left to be stationed at army barracks in Dorset the day before Kate's 25th birthday in early January.
At the time many were predicting a royal wedding, the paparazzi were becoming more and more aggressive towards Kate and William was spending a lot of time partying with the rest of his barracks.