They are a happily married couple now and parents of three children, but Kate Middleton and Prince William still had their fair share of problems when they were still a young couple.

The Duke and Duchess of Cambridge famously broke up in 2007 after several years together, but rekindled their romance after only a few months. However, the split came as a result of Prince William believing the relationship had potentially run its course—but Middleton felt that a proposal had been imminent before then.

As a result of their different thoughts about where the relationship was headed, and what each may have wanted at the time, the Duchess was forced to “accept” a trait about her husband at the time.

“He always had a roving eye, far more so than Harry, who is meant to be the family playboy,” sources said in the past of the couple’s relationship and breakup. “That’s something Kate has always known and accepted—it was part of the deal, if you like.”

However, it was that ability to potentially accept that the man she loved had a roving eye was what made her such a good candidate as a future Princess of Wales, since the predecessor of the title, Princess Diana, also dealt with such a factor during her own marriage.

“I suppose in that respect, she would have made a perfect Princess of Wales,” the source said. “What has changed in recent months, however, is the way in which the public was starting to view Kate as a future princess.”

Of course, a roving eye didn’t seem to last long, as Prince William eventually did reunite with Middleton—and the couple went on to become engaged a few years later and marrying in 2011.

Since then, the pair have welcomed three children together as well—Prince George, Pri9ncess Charlotte and Prince Louis.

Kate Middleton and Prince William
Prince William and Kate Middleton attend the 1st Battalion Irish Guards St Patrick's Day Parade at Cavalry Barracks on March 17, 2019 in Hounslow, England. Getty Images/Gareth Fuller