Kate Middleton announced her cancer diagnosis and that she was going to undergo preventative treatment.
William has handled Kate’s cancer diagnosisby focusing on their family.
The prince is still doing some royal engagements and stepping up following his father Charles' own cancer diagnosis.

However, William has shown he puts Kate first and prioritizes being a husband over being a royal.
Comparatively, Charles prioritized other things over Diana.
A friend of the royal couple informedPeople, “He is a very reliable, strong person.

She doesn’t feel isolated in this because of William, who is right beside her.”
William’s behavior as a father is markedly different from his own father, King Charles III.
It’s likely that William is faithful to Kate Middleton based on his behavior.

Conversely, whenthen-Prince Charles and Princess Diana were married, it was reportedly an unhappy union.
Charles had a well-publicized affair with Camilla Parker Bowles(now Queen Camilla).
It’s believed that Diana had a few romantic entanglements as well.
Diana also admitted to her own affair with James Hewitt.
She told interviewer Martin Bashir, “Yes, I adored him.
Yes, I was in love with him.
But I was very let down.”
The disappointment came from Hewitt publishing a book that included an account of their relationship.