I feel like this wasn't supposed to be boys love. In a sense, it was like Killing Stalking. It wasn't supposed to have a happy ending. After reading the first chapter, people should have been able to realize 'This isn't gonna have a happy ending'. It's a psychological breaking story, it's not supposed to be cute and end well. Yui was scarred due to past trauma and Kei was the same. Their relationship is not Love. That was made clear in the beginning. I feel like it's showing what this kind of thing can do to ones mind and soul.
I think Toono will end up with Kashima, and Yaguchi will end up with the blue haired guy. There may be some jealousy arc between Toono and Blue haired guy, which results in Toono and Yaguchi not working out and in the end resulting in Toono and Kashima. Also TOORU AND YURI ARE SO CUTE !!!! Yuri clearly wanted Tooru to tell him not to have sex with other people and just him but Tooru doesn’t want to intercept in what Yuri has going on thinking it would ruin their relationship !!! UGH I LOVE THEM !! GET YOUR MAN YURI !! (I hope we see more mentally there yuri during this )