He definitely screwed up. He did something awful by forcing this on her without her consent. He needs to truly come to terms with his actions and find a means of proving his sincerity.
She, too, has been an ass in her own way. She really hasn't given him an opportunity to talk about everything...
I see a lot of comments about the corset. We've clearly seen she wears undergarments (bath scene). The corset they were referring to was the waist-training type (because of the comment of a broken waist). But in the end, this is a fantasy world. Who cares what they wear?
Aw man, I was hoping the wizard would be her brother all grown up. It would have been so sweet, him learning magic just to give his big sister another shot.
Oh well.
Eusto is a bit of an idiot. If he loved her so much, how did he NOT notice her sudden personality change? As captain of the guard, he should have immediately begun an investigation, ESPECIALLY since this is a world where magic exists.