Responses
The uke was a victim of many complicated family issues, I think it would be harder for him to express such emotion than the seme who grew up with lovely accepting parents. Imagine the trauma he still carries even if the author doesn't state it clearly, they still try to hint it to the audience with his behavior.
Like seriously they have been dating for so long and it was frustrating to watch yhat he still wasn't able to express his true feelings. Also he never really apologized to myingook for what he did to him in school days (or did he?) Well it wasn't sincere enough...that was my opinion ╮(￣▽￣)╭..toodles