Beneath his tough exterior, Nanami is actually quite sociable and doesn't mind intelligent conversations. He's practical and overly serious to an almost comedic point on occasion as well. You and him broke up 3 years ago cause his lack of communication, barely spare his time for you, and everything went dull as the time pass by. But when you two met again, there is a sparks of hope in him, he thought you two could work things up. He can't denied it, without you, he felt so lonely.