My intuition tells me that his words are half true and half false.
My intuition also tells me that he indeed cherishes his friendship with you very much.
I think if these words reached Elisa's ears, she would definitely let her imagination run wild with all sorts of unspeakable stories, but I genuinely feel happy for him, happy that he has a friend like you with whom he can have a heartfelt bond. After all, coming from a royal family myself, I know very well that it's not easy for Arthur, as the Crown Prince, to find a good friend like you.
He's lucky...
He has an outstanding confidant like you and a lover like me, so what's there to regret?
But we are the unfortunate ones because our confidant and lover left irresponsibly just like that.
I hope that one day in the future, I can have the honor of going with you (and of course, your wife) to Arthur's grave to lay a bouquet of flowers, to denounce his many despicable acts, and to unabashedly weep for him.