Suzuya had always hoped for him, Kanata, and Tsukiko to be together but he realizes that it is not possible for little by little, his surroundings are changing and they are affecting those he cherishes the most. He notices the biggest change in Tsukiko and he is afraid that once she finds her prince charming he will not be able to be happy for her. Suzuya then states that Tsukiko is the most important to him now and even in the future so he will always be there for her to guard her smile. Even though he loves her tremendously and wants to be with her for eternity, he knows his wish could never be fulfilled. (thetvdb.com)