Person of Interest, Season 1

[Reese watching old videos in his ex-girlfriend's home]

Husband:
Who are you?

John Reese:
I was the guy who left her behind, because I thought she deserved someone better than me. I thought she deserved someone who would look after her, be there for her. I thought she deserved someone like you. So, I don't know. I was hoping you could tell me.

Husband:
Tell you what?

John Reese:
What am I supposed to be, now that she's gone? When you find that one person who connects you to the world, you become someone different. Someone better. When that person's taken from you, what do you become then?