Responses
Tiara is just sensitive about the interactions between Ashira (?) and Aqua because she is the Heroine of this story, so Tiara is scared the prince will fall in love with the other girl because of the events and it's understandable.
The prince doesn't know this and tiara never complains about anything so it'd understandable that they are both confusing each other

Well actually I’m confused right now. I’m don’t like to see tiara sad. But the prince somehow always put a good word to tiara at the end he hurting tiara.
Is just him can’t see or only elito (what was his’s left man name? Sorry im forget) and jer main just realised about this?
It like tiara escape from the bastard prince at first and now she even get the worse prince