Yeah it's more of one of those things where the guy is just patiently admiring the girl from a distance because he doesn't want to force her to make a decision. It's not really a major theme for the story as a whole but rather just a detail for their character interactions. I can't go into huge detail without going on a long winded explanation but to make it short the girl has a variety of reasons as to why: a) she hasn't notice the guy likes her and b) the guy hasn't approached her about his feelings. The stories they are in more or less focuses on something else (like this one is about them being abducted by a theater ghost and being forced to perform a play) but I don't want their interactions to be too predictable because of their relationship.