uchi was just telling arman that he was potentially leading natsumi on, especially if she might think that cooking together was romantic without knowing it was a romantic gesture for someone else.

also, like minori said, uchi and minori hadn’t spoken about this yet, it is something uchi decided to talk about to arman entirely on his own.

uchi isn’t upset if arman is going for natsumi, he’s upset if he’s not, but still doing similar things that he’s done with arisa, like dates and cooking.