(Apologies for the extreme necropost; Itch rarely ever informs me of comments/posts (*sweating*)
(Official) Answer to Aoi and Hinata's relationship.
From the official guidebook:
[Q: What was it that attracted you to Aoi?
Hinata: Was I even attracted to Aoi to begin with? I mean, I do like him, and I guess it would be a total lie to say I wasn't attracted to him at all! Well, uh... I guess what people really want to ask is; "Was your relationship really a romantic one?". But if you ask me that, then I can't give you an answer. Because neither I nor Aoi knew what love is. For Aoi, who couldn't accept himself, and I, who didn't even know who I was meant to be, what we needed first and foremost was to love ourselves. That's what our route is about: self-discovery and self-acceptance. So in that way, our story is fundamentally very different from the story of Sakura and Itsuki. Aoi and I weren't even in a place where we could fall in love yet.]
The terminology used in game for 'falling in love' between them in the JP version is used for explicitly romantic love, but like mentioned, Aoi and Hinata both have a very confused sense of what love is due to their upbringings. I do think what Itsuki says about them being tied together with the red string is true and that they would have genuinely loved each other had they the chance, if only things hadn't worked out as they had, and regardless of the complicated nature of their relationship.