Because in his subconscious understanding, this was something he should do himself, and he shouldn't burden Isadella with worries in her already busy schedule.
Of course, if you really want to turn it around and understand it as Her Majesty the Empress said.
This indeed could also be seen as Shiayar being unable to truly open his heart when facing Isadella, unlike when he faces Silvia and Ennie.
"Aren't I just worried that Your Majesty is busy with state affairs..."
Shiayar pondered before speaking.
However, his words were interrupted by Isadella before he could finish.
"No need to say more, I actually understand it all."
"In your eyes, my identity is first the Queen of the Empire, and only then your lover and companion."
"This difference predetermines that my relationship with you cannot be like Miss Silvia, cannot be like Ennie, to become a girl solely belonging to you, truly living just for each other."
Isadella blinked her beautiful crimson eyes.
