How is it that

How is it that i've come to think about you.
It's been two long years, but the thoughts come to me as if they happen yesterday.
Why is it now, as i try to sleep that i think about you.
I remember times in history class, in the hallway and times when your name came up in conversations.
I remember you in times that others most likely would have forgotten already.
How is it that i can recall those times like they just happen, thou i don't always remember what happen a week ago with such clarity.
What is it that makes me remember.