The thing is... it’s easy to tell someone just to break up but when your in one it not that easy, nor is it that desirable. Maize loves Izu, he has made her happy, she accepted that her is a demon, but he lied to her; made a fool out of her. The question is if she can forgive that! And if she can trust him again. That will take work on his part, but that doesn’t mean the relationship should just end.
The thing about these stories I’ve noticed is that divorce get’s bandied about almost flippantly, as if marriage means nothing. I may not be big on the sanctity of marriage (Atheist) but in it’s core it’s the exchange of oaths. An oath shouldn’t be broken lightly and can not be when made as sincerely as she had. Even Izu was sincere in his oaths if not entirely sincere with maize.