Responses
No. The ex left without a word. So to Shiki it was as good as if they broke up. But not only that. There's also that feeling of betrayal. Yes, Wataru had good intentions but those aren't enough. His actions made Shiki suffer. And Shiki moved on. And Shiki doesn't realize Tenma's age well until the end
So the ex is a really good guy, Seme is high schooler, uke is cute but thinks his ex. Why it is so complicated. It could be simply uke and the good ex guy :) No ?