I don't think he's necessarily oblivious to her feelings, I think he picked up on the fact that she has disastrously low self-esteem and wants to be absolutely sure that if she's doing something, she's doing it because she herself wants to and not because she thinks he wants her to or that she's obligated to.
The times she's been the most forward, she's always prefaced it with "I heard guys like-". It doesn't matter if they like each other, if she completely neglects herself it won't be a healthy relationship.
the whole "i heard guys like [blank]" isn't evidence of her throwing herself away to please a guy, it's because she wants seiichiro and was trying to seduce him, but lacking experience she can only work off second hand knowledge. that wasn't neglecting herself, it was trying to pursue what she wanted. that's why she came out of that conversation so confused, because he was wrong.
and that's what i'm talking about, he isn't actually trying to make sure she's doing things because she wants to, he's taking for granted that she's
not doing them because she wants to and proceeding accordingly. it's more about what he thinks she's thinking than him actually trying to understand what she's thinking, and that's why i'm attributing it to his obliviousness more than anything else. in didn't take that conversation they had at the love hotel as him making a real insight into her motivations, that was him putting a wall between them out of a complete misunderstanding for her motivations because he refuses to believe that her feelings for him are mutual. that's why i said he's projecting, i don't think
she's the one with disastrously low self esteem here.
this bonus chapter is a great example, because she's not trying to hide the photo because she doesn't necessarily want him to see it, but because he has put a ban on sexy costumes due to his inability to react to them neutrally, the way he assumes she intends to wear them. she is hiding the photo as an attempt to accommodate him, and he is working so hard to maintain a neutrality in their relationship that he gets the bondage gear out to keep himself from looking at it. he's not the one accommodating, he's the one being accommodated. he is the obstacle.