oh yeah, since nobody started this discussion.
what do you think is the problem with Nakamura's previous relationship.
It's clear that his stoic personality bars a lot of his emotions and feelings from showing, but from us reader's standpoint, he's shown to be expressive towards people he care for.
so, the question is.
1) Did the previous girls who dated Nakamura not notice him smiling at certain times?
or
2) Nakamura weren't that totally attracted or cared for the previous girls he dated, and as such didn't smile?
Just had this thought come up while I was rereading this chapter.