Gossip Girl, Season 5

Chuck:
Dr. Krueger thought you were upset I returned the ring.

Blair:
He has too many PhDs. They cancel each other out and make him a moron.

Chuck:
I returned it because you asked me to let you go. I wanted to move on to give you the happy life you deserve.

Blair:
All this time, I've blamed you for pulling me into the dark. But I was wrong. It was me who brought out your dark side. And now that I'm with Louis, I've done the same to him. I'm sorry.

Chuck:
You never pulled me to the dark side, Blair.

Blair:
I appreciate you trying to make me feel better, but I have my answer.

Chuck:
You were the lightest thing that ever came into my life.

Blair:
Then... why did it take letting me go to find this whole new side of yourself?

Chuck:
I only turned dark and desperate because I was afraid of losing you. Your love kept me alive.

Blair:
But you survived without me.

Chuck:
The worst thing happened, and I didn't die. But I had to find a new way to move on with my life. I only want you to be happy. I'm just sorry it couldn't be with me.