I thought that I'm already desentisize to all the wretched cursed deepest pit of the hell kind of theme: shota murder rape mindbreak gore, you name it. But now i found out that I can't never tolerate a cheating ass motherfucker. This aggravates me so much I can't calm I wanna smack the fuck out of that sonofabitch.
EDIT: Ok, now I can see what's happening. So this is more like "I'm seeing too close that I lost my way". Na-chan forgot how to love bcs he had everything that he wants, he took his relationship for granted. He lost the thrill and just want to "feel" again by being involved with someone else, forgetting that his act also hurting his loved one. Old me, if I were Arata, would've just said fuck that and break it off. But we see that Na-chan is still hugely in love with Arata, he just forget how to. And by distancing themselves, they have new perspective, they see something new, something else that could make them fall in love again.
This is the first time I felt satisfied about something I disagree with. I usually would've hate the ending, but sensei made her story very clear and I get the message so I'm happy.
Nigai no Theme