Sober

He never wanted to keep Aya's mom unknown to his daughter. She is still her biological mom. She conceived Aya. She gave Aya's name. But, everytime he looked at his daughter and remembered that he almost lost her because of her own Mom, it makes him think that it's better to keep her out of Aya's life. Everything is fine the way they are right now.

Aya is smart but there is still an innocent child dwelling inside her. And he doesn't want to lose that innocence if she knew about what her Mom did. Well, he has no plans of telling Aya what she really did because that would terrify his kid.

After all, how is he going to say to his daughter that her Mom was an addict? Literal addict.