So I am saying that the Duke and Duchess of Cornwall might in fact be quite content together...considering all the pain that was involved in finally getting them together I hope they are. But we cannot know for sure simply by how they appear in public. It's not that simple.
The question is IMHO whether you believe in fairytales or not.
People who live together in close relationships have all their own problems with each other. Even in marriages who appear to be "made in heaven" it happens that both are developping their personality and find that they have to accommodate new developments, opinions, wishes and behaviour that wasn't there before. How they deal with this "growing" is, viewed from the later perspective of the historian in case of prominent couples, up to interpretation.
But - for Charles and Camilla speaks the information from the Dimbleby-book about their relationship - note that Charles agreed to all the statements in Dimbleby's book before it was published, so this is how Charles sees it, too:
From page 277:
Her (Camilla's) warmth, her lack of ambition or guile, her good humour and her gentleness endeared her to the (Royal) household.The Prince had come to regard her as his best friend, in whom, more than in any other, he could totally confide. She was, as he would later explain, his "touchstone" and his "sounding board". They were not often alone together but they talked frequently and at length on the telephone, and in the process their feelings for each other grew in strength and intensity to the point where their deep freindship could properly be described as "love".
Page 293 - description of his honeymoon with Diana:
"When he was not sailing and bathing, he sat in the sun reading from a selection of books provided for him by van der Post (a philosopher-guru of the prince at that time)." From a letter he wrote on that honeymoon:
"Diana dashes about chatting up all the sailors and the cooks in the galley etc. while I remain hermit-like on the verandah-deck, sunk with pure joy into one of Laurens van der Post's books..."
And here's a pic from his recent cruise in the Carribean with Camilla, his "touchstone":
http://img.dailymail.co.uk/i/pix/2008/02_03/charlesDM2202_468x310.jpg
Somehow I'm not afraid of what the world will find out about their marriage after their demise. If after so many years a pic like this is possible, I believe all is well with them.