Dean and Sam in “Unfinished Business”

Dean

I can't do it with out you

Sam

You can barely do it with me. I mean, you think I screw up everything I try. You think I need a chaperone, remember?

Dean

Come on, man. That's not what I meant.

Sam

No it's exactly what you meant.

Sam

You want to know what I confessed in there? What my greatest sin was? It was how many times I let you down. I can't do that again!

Dean

Sam...

Sam

[Starts to tear up] What happens when you've decided I can't be trusted again? I mean, who are you gonna turn to next time instead of me? Another angel, another... another vampire? Do you have any idea what it feels like to watch your brother just...

Dean

Hold on, hold on! [Sam cries a bit more] You seriously think that? Because none of it... none of it... is true. Listen, man, I know we've had our disagreements, okay? Hell, I know I've said some junk that set you back on your heels. But, Sammy...come on. I killed Benny to save you. I'm willing to let this bastard and all the sons of bitches that killed mom walk because of you. Don't you dare think that there is anything, past or present, that I would put in front of you! It has never been like that, ever! I need you to see that. I'm begging you.

Sam

How do I stop?

Dean

[Dean starts walking towards Sam] Just let it go.

Sam

I can't.. It's in me, Dean. You don't know what this feels like.

Dean

Hey, listen.. We will figure it out, okay? Just like we always do... Come on.