It's okay. [ Her reply is soft: she knows Blue had met Zack, too, and assumes they'd been friends. This is far from a loss just for Aerith herself. ]

I... Yeah. I haven't been to every nook and cranny, but... [ It's enough that she'd made this message, at least. ] You don't have to do something like that, but...if you do find him hiding out somewhere, um...let me know he's okay?

[ Otherwise, for him to have returned to Midgar... It's unclear just how "okay" he really is. ]