[... well, gosh. When he puts it like that, it makes perfect sense.]
Like graduation, right? You and your friends all go to different colleges, but you remember all the stuff you learned from them and keep them in your heart. And then after college, it happens all over again.
[That doesn't seem sad to her anymore, though. She's really impressed by Takami - she fell for him because he's cute and tall, but there's so much more to him. He really is an incredible guy.]
Gosh, you really sound just like a grown-up! How'd you get to be so mature and smart?