They're making this into such a big deal. ? Honestly I don't see a big problem of him spending one day with some random woman as a problem. If he hasn't changed his feelings for who knows how many years, one or two days spent with someone isn't gonna do anything. But it would be nice for them to at least sort this mess out.
I don't really get Tachibana's phone call, it's not like Yuu hasn't done anything...but I guess it could give him some kind of motivation here.
That last panel looks good. And thanks for the translation notes ?