The timeline of Prince Charles and Princess Diana‘s relationship has a tragic end. Their marriage was painfully complicated, full of infidelity and two souls who were never meant to be matched.

Their divorce, 15 years after their wedding, was messy. The couple decided to start official proceedings shortly after Diana’s infamous interview with Martin Bashir after the late Queen Elizabeth II wrote them both a letter asking them to end their relationship.

But the most heartbreaking parts of their relationship played out in the press and was captured in photographs – so where did it all go wrong for Prince Charles and Princess Diana?

How did Prince Charles and Princess Diana meet?

The couple actually meet while Charles is dating Diana’s sister Sarah – they were in a relationship between 1977 and 1978. He had traveled up for a shooting weekend at their 1,500 acre family estate, Althorp.

They’d spend more time together in group settings, even after Charles and Sarah break up.

In 1980, Diana and Charles have a heart to heart as he grieves the death of his great-uncle and mentor, Lord Mountbatten, who died the year before. She says this was the moment that Charles saw her romantically.

She said: “The next minute, he leapt on me, practically. But then it sort of built up from there.”

Over the next few months, they continue meeting, which the princess later said was mostly in group settings and not alone. Their relationship is made public September of that year.

Read more: Moment Charles and Diana’s marriage started to ‘deteriorate’ as ‘other woman’ claims shut down

How old was Diana when she married Charles?

Prince Charles took his relationship with Princess Diana to the next level when he proposed at Windsor Castle in February 1981.

However, when a reporter asks the future king if they are in love, he replied “whatever in love” means.

750 million people across 74 countries watch their wedding at Westminster Abbey on July 29, 1981. The woman who was about to become a royal revealed she had doubts before walking down the aisle.

But her sisters said it was too late to call it off and she went through with it.

They kiss on Buckingham Palace balcony, believed to be because Charles didn’t kiss his bride at the end of the ceremony. It sparked a tradition royals have continued ever since.

Diana was 20 years old at the time, and Charles was 32.