[Yuya's mouth twitches, as if he's going for a smile, but stops it right away. He wants to say he feels the same, in fact he knows that once- he absolutely did feel the same. But now? Now he's not sure, and it's not her either, he's just always...]

... Sad... [He mumbled out, quite possibly not meaning to say that out loud at all.] I-I mean... I- I feel happy too, or I used to but...

[He pauses for a very very long time.]

I don't feel happy all that often anymore... I wouldn't want to bring you down with me...