From spoilers I saw, he never married that leech. She was always just a candidate bc of her family name and sabotaging other candidates
So far he has not married Visti, she just thought he was going to because the families have been close since way back. Seems like he's trying to increase Lilliana's standing and make her Empress because he just emphasized to her while smirking that it's "unfortunate she's a princess of Nieta" and then Nakle came into the picture as a supporter for her. Though that's still looking iffy with all the machinations of the Gaviel family.
I don't like stories where the ml has multiple wives, even in name only...can someone spoil me? Is he really going to marry someone else? Or maybe he'll raise her status thanks to the fact that she's a spirit mage or something like that? What will happen to her agreement with the brother and sister duo?