I mean, I don't blame Amane for acting like she does with her ex Nene. I acted similarly with my ex skinship-wise, and he was fine with it too for a bit, then he told me back off, and I did mostly because it just hurt to not be wanted anymore. Shouldn't have even tried being straight to begin with...
At some point, cruel just naturally happens. People don't like feeling uncomfortable, so they act cruel to feel less uncomfortable.
There's a thin line between love and hate; they're actually basically one in the same. Here's what I mean in a scenario of feelings for someone I used to love, but now hate:
-I can't stop thinking about them.
-My heart races when I think about what we've done together.
-I hope the worst for them (when in love, I hoped for them too, just the best instead of worst).
-I feel strong sensations when I think about them.
Dunno how Amane has the strength to hang around. Then again, she's 15, and I was 25. I had more energy and hope and resilience back when I was 15. Heartache, but less beaten down and defeated by it. Still was hopeful.
I will end my thoughts with: no break up is ever mutual.