He knows nothing about basic human interaction, nothing about his country, nothing about his harem, literally nothing at all. His entire character so far is purely convenience for explaining her circumstances. Even his reason for "loving" her in the first place is superficial bullshit. The author is very bad at justifying their plot devices.
Also because I'm ranting anyway, why is his magical "destined mate" not instantly position 1 in the harem, or even in the harem at all. It's literally set in stone that he WILL love her, no matter what. It's not even an option. And furthermore why have a harem at all if he's going to, at some point, lose all his sense upon meeting some woman? Even if a political harem was useful, he's not using it and it seems ridiculous to not have systems in place for said mate to be external to it, given the mate is ordained by fate itself. The crux of this plot is built on a harem that is utterly pointless because of the very same plot. Everything about this story's writing annoys me.