Nothing's really decided yet y'all dummies.
Tadano himself said he has nobody he's interested in just a couple of chapters ago.
Hello??? Don't y'all see the only ones who fell in love in this so-called love triangle are the girls, Tadano doesn't show any interest in any of them as a girl, to the contrast of how the girls do in almost any chapter if there's Tadano. All of that blush or embarrassment doesn't mean anything in that regard.
If you don't see that then idk why are you even reading romcoms.