WTF, when did Ryoma become more emotionally mature than Tezuka? Why does that work? :/

I love how bold Ryoma is there, and how (even though they haven't seen each other for several years) he knows that Tezuka will both check his e-mail eventually and delete his e-mail messages unread. But Tezuka (whose games there were spot-on) sucks. Totally sucks. It's lucky I don't believe that Ryoma would let it end like that, whether Tezuka thinks it's the end or not. :D