Idk, I think they just have different ways of expressing their love? Shizume seems to care just as much for Kiumi, he just isn't one to use his words to show it. Ultimately a relationship is about the people in it, and not telling others doesn't necessarily mean that it's not a real relationship where both are in love lol
But yeah, to each their own cause I couldn't handle being with someone who is completely closeted and plans to stay that way
some people just don’t mind i guess and good for them and yeah you are right about shizume now that you put it that way he just seems like a traditional tsundere
i understand that he does not wanna be out and his boyfriend is okay with that but if i was in that position i’d be hurt 24/7. i guess that’s why people say each to their own hahahah it feels like they’re just fwb and only one person is truly in love and the other is just going along because the sex feels good