I understand both Hiraagi and Shizu. Shizu might either not believe Hiraagi loves him or maybe he does believe it but he also knows compared to the affection Hiraagi held for Yuki (whether it be romantic love or platonic) he will never come in first. And he knows Hiraagi is feeling lonely after Yuki’s death (I’m sure he is too) but I also feel like he understands that to a certain point he was used by Hiraagi and get over his own guilt and loneliness of Yuki’s death and hearing a “confession” (depending on his Shizu believes it or not) after that must hurt like shit, especially since I think Shizu likes Hiraagi. Hiraagi has also felt lonely this entire time, after Yuki’s death but even way before that since he felt like he was the one left out from Mafuyu, Yuki and Hiraagi. But I also feel for Hiraagi bc we see how he’s loved Shizu from the very beginning and the love he held for Yuki was more of an admiration than romantic. And he feels guilt for Yuki’s death bc he felt like he wasn’t able to prevent it and that whole thing about how he knew about Mafuyu and Yuki’s relationship but never helped. So despite being in love with Shizu the guilt and loneliness of losing his best friend led him to dismiss Shizu’s feelings and use him over his time of grief and making decisions on his own like deciding to complete Yuki’s song after all this time and using the excuse “it’s for mafuyu” rather than admitting that it’s for his own well-being.
I understand both Hiraagi and Shizu. Shizu might either not believe Hiraagi loves him or maybe he does believe it but he also knows compared to the affection Hiraagi held for Yuki (whether it be romantic love or platonic) he will never come in first. And he knows Hiraagi is feeling lonely after Yuki’s death (I’m sure he is too) but I also feel like he understands that to a certain point he was used by Hiraagi and get over his own guilt and loneliness of Yuki’s death and hearing a “confession” (depending on his Shizu believes it or not) after that must hurt like shit, especially since I think Shizu likes Hiraagi. Hiraagi has also felt lonely this entire time, after Yuki’s death but even way before that since he felt like he was the one left out from Mafuyu, Yuki and Hiraagi. But I also feel for Hiraagi bc we see how he’s loved Shizu from the very beginning and the love he held for Yuki was more of an admiration than romantic. And he feels guilt for Yuki’s death bc he felt like he wasn’t able to prevent it and that whole thing about how he knew about Mafuyu and Yuki’s relationship but never helped. So despite being in love with Shizu the guilt and loneliness of losing his best friend led him to dismiss Shizu’s feelings and use him over his time of grief and making decisions on his own like deciding to complete Yuki’s song after all this time and using the excuse “it’s for mafuyu” rather than admitting that it’s for his own well-being.