Responses
She's talking why he didn't say about it and he answered her like that. So, what will you do if someone said that instead of explaining it? Yeah, he said he doesn't want to say it because of the other couple he should've just stopped there, but no. He added it doesnt concern her. Maybe yuki's thinking that it should've known only to him? She's already overthinking that's why when Naruse answered him like that she snapped.
Fuck you, NARUSE! I wish Yuki will break up with him this time. I mean, girl, try and give yourself time to change too. I mean you changed already but try more. Smile and talk a lot with other people too. Make that insensitive, stupid Naruse to notice that he's really an asshole!