A few chapters back... Maybe more then a few when they showed him it did seem like he had a thing for Ayame whether they will pursue that or not I don't know but it did make it seem like he was basically the male version of the girls that all worked for/interacted with both Miss Sunflowers. Helps out etc but seems to also like the owner of said store type thing. I could be wrong but again I thought the same thing.
He may have something for her, but Ayame doesn't seem to reciprocate any of those feelings, from what I can tell anyways.
I think that's certainly the case for now. I'm really less talking about the feelings of the fictional people than the narrative strategy of the author--Part-time-kun doesn't get enough attention to be a meaningful character, but the repeated detail of his extreme reliability seemed to be just a tad more than necessary. It's hardly important, but it struck me as a bit odd.
To quote my least favorite dialogue trope in manga, anime, and Kdramas, "Never mind. It's nothing."