After all, he was already in his 30s when he met the still teenageDiana.

According to royal expert Elizabeth Holmes, Diana was thought to be exactly who he needed.

It was sort of like a formality, almost," Holmes said of the situation.

Princess Diana and Prince Charles wedding

“Looking back in hindsight, it’s very easy to find all the red flags …

It was like, ‘We’re marching forth.

We’re doing our duty.'”

Princess Diana and Prince Charles looking away from one another