"You are his wife!"
That actually managed to make me smile. Lilia is cute. This is probably one of the few times I don't mind a misunderstanding going on. As expected with his cardboard personality, he was only puzzled at best about it. No real harm done it seems. Although Lilia will have a real uphill battle to fight if she wants any serious romance with our cardboard protagonist here.
I'm feeling a bit more sorry for the new saintess, she's at least legitimately concerned about her country, unlike that selfish blowhard of a prince. She deserves a better man if she wants to get married, assuming the kingdom doesn't fall into ruin first.