To be fair, his, no matter real or not, lack of interest in her is getting quite stale and tiresome at this point. You can only stall development this much.
@N0Mi0 I don't know why people are this surprised. He's like a decade older than her, at least. He's a wholesome good guy, it's not even in his radar that a younger girl could be interested in him, so he's not looking at her sexually, that's it. If she dropped the fucking tsundere act (which is my opinion what makes this "stale and tiresome"), he'd react alright.