One of my biggest gripes with automne was how Yuzuriha chose someone who always toyed with her feelings, until the bitter end, while the Ringo ending had her actually start processing what she's been put through.
Ringo ending shows that Yuzuriha is not able, and likely will never be able, to fully let go of Nerine though, and the reason for that is that she wasn't able to close that Nerine gestalt, so to speak. What makes Ringo ending different to True and Nerine endings is the lack of confession scenes where Yuzuriha avows once again and when Nerine finally opens up about her manipulative actions during their shared childhood. So while Ringo might've been a "healthier" option for Yuzuriha, it's clearly not what she truly wants. (I also think that the writing is aware of this idea, for example, in the Nerine ending.) I might've been more receptive to the idea of Ringo genuinely being a legitimate love interest for Yuzuriha at this point in her life if she chose Ringo after Nerine refused to accept her second confession, but not as it stands.
I also feel that saying that Nerine toyed with Yuzu's feelings this whole time is kind of a stretch. While she was manipulative when they were children, she transformed into a practically different, much more introverted and gloomy, person after that meeting with Yuzuriha's mother. Yeah, a part of this wallowing self-hatred of her is really just self-pity (her selfish self-sacrifice during the Werewolf incident is an example of that) and her desire to uphold the status quo, until the second confession by Yuzu also pushes her to confess, did hurt Yuzuriha. But that's not what I would call "toying with", at least not in the present moment.
There's a lot more I could add, but I feel like it's not the right place to write a long-winded character analysis. So here's a bit of an unstructured ramble that explores their relationship in more detail (not by me, but I did ask permission to share it).