The Prince and Princess of Wales' brief split is making headlines again following the release of the documentary 'Kate' and some are recalling how differently the pair handled their breakup back then.

When Kate Middleton celebrated her 43rd birthday on January 9, her husband Prince William wrote a tender message and shared it on the couple’s public Instagram account. According to royal expert Ingrid Seward of Majesty magazine,

Throughout Kate Middleton's tumultuous year, Prince William has remained steadfastly by her side, maintaining a sense of stability as she navigated cancer. A source close to the royal household tells PEOPLE in this week's exclusive cover story that the Prince and Princess of Wales are "more open" now and "talk about their relationship together.

Prince William and Kate Middleton fell in love while they were both students at the University of St Andrews in Scotland, but they almost never crossed paths

Kate Middleton has been the bonding force between Prince William and King Charles as father and son don't always see eye-to-eye.

A source close to the royal family commented on the pair's marriage following Middleton's latest health update.

Kate Middleton has said it's a 'relief' to now be in remission following her cancer diagnosis, with one source suggesting the Princess of Wales had been struggling