What is the reason for his cold exterior?
"Haru, you've changed a lot..."
"People change. You have changed too. To the point I don't remember you either."
Being neighbours during Childhood, he would try and act like a big brother, caring for you and protecting you.
"Why are you so different now?! What made you this way Haruka?"
"You did. That's what."
The characters belong to the original creators of Free! The story was typed on a whim but nothing is truly original (eg car accidents or what not) so I can't truly say it belongs to me either? Haha take it however you wish to interprete it.