Do you have the phone yet? If so it should have an app that lets you see details about people you have met. Including a rough outline of their schedule
Er... I don't know if I somehow managed to do things in a different order even though that part of the progression seemed 100% fully linear to me, or you just don't remember that far back... but first of all, I'm pretty sure you can't meet him before getting the phone. And that app doesn't appear until much, much, much later. But yes, I do have that app. However...you... do realize that if I had met him while I had PATS, I wouldn't be having issues locating him? Like... as far as I could tell based on my playthrough, literally the thing that triggers acquiring PATS *is* going back home after meeting Blood. If there's another pathway, then apparently I just happened to fall into that one unintentionally.
In any case, I've uninstalled the game and don't intend to play it any longer. I'm attributing most of my frustration to game-breaking bugs, but if they aren't bugs, it's so horrifically unintuitive that I have no possibility of ever enjoying myself while playing it.