William is said to be "angry", "frustrated" and "deeply disappointed" at the whole saga, according to the Daily Mail's royal correspondent Rebecca English.
She said in an article for the same publication: "'When will it all stop?' He (William) is said to have asked."
Ms English added William has "worked hard" to protect his family from the "worst excesses" of being in the public eye, learning to work with the established British media and being afforded "unprecedented privacy".
Our community members are treated to special offers, promotions, and adverts from us and our partners. You can check out at any time. More info
Prince William visits Sheffield for The Royal Foundation's Homewards programme (Image: Getty)
But the first in line to the throne has learnt the hard way that the degree of control he has experienced with the media in the UK doesn't extend to the "sump of social media", according to Ms English.
We use your sign-up to provide content in ways you've consented to and to improve our understanding of you. This may include adverts from us and 3rd parties based on our understanding. You can unsubscribe at any time. More info
Internet trolls are fuelling bizarre rumours about Princess Kate (Image: Getty)
Ms English cited royal insiders who fear William will become "even more insular" due to Kate's experience.
The royal expert said that William and his team aren't "minded" to react in public to "the madness" surrounding Princess Kate.
She added the Palace has not "entirely ruled out" making some kind of public statement ahead of Kate's return to royal duties.
Ms English wrote: "It has been tough for him (William) to stand by and see his wife’s reputation shredded by the court of public opinion in the way his late mother’s once was.
"How he handles the situation moving forwards will surely be a mark of the King he is one day to become."