I think the part that gets me is that Miyuki is sitting here worried about Sorata rejecting her, when if she'd ever actually listened to what he says to her or watches what he does for her, she'd see that he's been tying himself in knots trying to do everything for her sake and putting her first. Including to the point that he'd rather she go back to Kyoto and attend a school that suits her level of ability, rather than staying in Tokyo at the level of school that he could just barely manage to get into.
At least she's self-aware about the fact that she really has only been thinking of herself, if she's genuinely questioning whether Sorata really loves her. You'd think the last decade of their lives together was spent with her eyes closed and her ears blocked, given that logic.
But at least it would seem they're finally about to actually talk. The key, though, will be whether Miyuki defaults back to her usual "Kyoto-isms", and if she does, whether Sorata finally speaks up saying "I don't actually know what you mean when you talk like that". If that happens and they can segue into revealing what Ayano's been pulling for a decade now, maybe a lot of this can be sorted out and resolved between them.
If that misunderstanding is allowed to persist...then even if they resolve this current problem between them, that's just stalling out the story for the sake of maintaining the original gimmick, but in a way that would feel more forced than ever, given this is the chance for that gimmick to be revealed and confronted. Even PrettyBoy has figured it out, and he should maybe speak up as well, because Sorata has to figure this out. Even if it means the end of the series, better that, than letting it continue to drag on forcing a mismatch of communication that really could be solved here and now, and arguably is supposed to be solved here and now.
Also - I know that Mary is Miyuki's friend first, but her just automatically assuming that Sorata did something wrong and was deserving of a beating just reinforces how much I kinda dislike her character. She's just really flat--she had some good development around her "feeling like she doesn't fit in" and all the bullying she went through, but for her to turn around and do the same thing to Sorata, when I'd argue she should be more in-tune with his sensitivity and being misunderstood than most, feels like a waste of her character.
Yes, Sorata has PrettyBoy on his side, but all four of them should really be a cohesive unit. Mary constantly getting on Sorata's ass about every little perceived slight (whether it's real or not) just gets so tiring after awhile.