Prince William and Kate Middleton’s relationship has endured for decades and remains as strong as ever.

Roya Nikkhah, the royal editor for The Sunday Times and co-host of the podcast “The Royals with Roya and Kate,” told Fox News Digital that the Prince and Princess of Wales are “still very into each other” despite facing a challenging year.

“When you see them on engagements, they’re obviously still very into each other,” Nikkhah remarked. “One’s always looking out for the other. Recently, when they were in Southport together, you could see that… she was a bit more vulnerable. I think they’ve got each other’s backs.”

Nikkhah continued, “I think when you have that weight of public scrutiny on you, it’s very hard to keep a little bit of your private life private because you are so publicly scrutinized. But if you look at the video they put out when [Kate] announced she’d finished chemotherapy, we never get to see them like that.”

“A lot of people were quite surprised to see how open they were in terms of letting the cameras film them as they were, as they would like us to see them, which was hugging a lot, kissing and being extremely close physically on a blanket,” she added.

Royal expert Richard Fitzwilliams shared with Fox News Digital that from the very beginning of the couple’s marriage, William “zealously guarded his family’s privacy.”

“He postponed beginning full-time royal duties for as long as he could for this purpose,” said Fitzwilliams. “William and Catherine… have always indicated their private closeness and harmony, which they project publicly so well, as does their competitive spirit, especially when they relax during royal tours that involve competitive sports.”

“As the future king and queen, they have a loving family who are the center of their lives,” he shared. “The recent video when Catherine told us she was clear of cancer showed intimate moments between them. The royal family is not known for public displays of affection, but their body language spoke volumes. Catherine’s illness with William spending so much time with her will, if that is possible, draw them even closer.”

The Prince and Princess of Wales first crossed paths as students at St. Andrews University in 2001. They tied the knot in 2011 and are proud parents to three children: Prince George, Princess Charlotte, and Prince Louis.

The royal family has faced a series of health challenges this year, starting with the January announcement that King Charles III would be treated for an enlarged prostate, while Kate underwent abdominal surgery.

In February, Buckingham Palace confirmed that Charles was receiving treatment for an undisclosed form of cancer. Six weeks later, Kate revealed that she, too, was undergoing cancer treatment, putting an end to the widespread speculation about her health that had been circulating on social media since her surgery.

After Kate’s revelation, William took a break from his duties to be by her side and offer his support.

Kate Middleton, dressed in a white top with navy stripes, was seen sitting on a bench as she announced her battle with cancer.

In September, the 42-year-old shared the uplifting news that she was cancer-free. Appearing with her husband and their children, the princess reflected on the challenges her family faced over the past nine months. She expressed “relief” at successfully completing her treatment.

“This time has above all reminded William and me to reflect and be grateful for the simple yet important things in life, which so many of us often take for granted. Of simply loving and being loved,” she said.