He's the one

This story is how Sakura met Sasuke.
She became friends with him. One day Sakura starts hanging out with a mysterious boy who
Sasuke doesn't like. He goes into a deep depression not speaking to any one ever again.

Who is the mysterious boy and why does Sasuke know him?
Will Sakura ever notice what she's done to Sasuke?
Will Sasuke ever be the same way again?

DISCLAIMER:
I do not own Naruto(including all charecters from Naruto), photos, videos and songs that are used in the story. Credit goes to their owners.
I however own the story plot and my own individually characters.