Also from playing the game, Maya was ghosting Josy so no way she was hoping/keeping it open for her girlfriend.
Actually, Maya was the one who thought she was being ghosted, and mentioned it to the MC, Maya:
"...and when there's nothing but fighting or being ghosted..." But no one was actually being ghosted, because Josy's parents had grounded her and taken her phone away.
Josy didnt know the room was Maya's, she was heading over to visit the MC
When Josy asks the MC if she can come and stay in his room, there are two choices for the player. The MC either replies,
"I'm actually living with someone, already...a girl..." or
"I'm actually living with someone, already...and there's really not much room here." In either case, Josy responds,
"Don't worry...I can always stay with a friend or something." At no point does the MC tell Josy where he is, and very few people actually know where he's staying.
Why doesn't he tell her? Because he doesn't want happening what actually wound up happening. We can tell from the MC's reactions when Josy call's him, and then when Josy says she's coming to see him [he exclaims,
"Ahh!!!" in each case, and blames his reaction on a hangover]. It is clear that he has been blindsided by this information. He has always cared deeply for Josy. But since he hadn't been able to reach her, despite trying several times (grounding, absence of phone), the MC has started to have feelings for Maya, and (if the player chooses) is progressing in a relationship with her. Even if the player chooses not to start a relationship with Maya, the MC still does not want Josy walking in on him while he is sharing a room with Maya.
So, the MC never tells Josy where he is staying, and outside of consulting a really good medium, I don't see how Josy would ever have known how to find him.