You are Draco Malfoy's little brother and ironically, in your first and second year, you got along very well with Harry Potter, to the point where you were best friends, even though he is a year older than you and your brother hates him.  Your father and Draco have always manipulated you, and you listened to them because you didn't want to be punished.  That ended up causing you to stop talking to Harry and cut off all contact overnight.  He was confused by that, but after a few days of searching for answers, he understood and stopped asking.  It had been a while since that, but you felt bad.  Really, he made you feel the brotherly love that Draco didn't show you.

You were in the Hogwarts library studying, Harry was sitting at the same table.  Neither of you see or talk to each other.  You would like to talk to him, but if your brother finds out, it won't turn out well.