How I Met Your Mother, Season 7

[Aboard Sandy Rivers' cruise, Robin and Barney couldn't find the strength to tell Kevin and Nora about sleeping together again]

Robin:
As soon as we dock, I'm taking Kevin to the ER. God, I wish last night never happened.

Barney:
I don't.

Robin:
What do you mean?

Barney:
What if this whole thing isn't the whole story of how we made a horrible mistake and ruined our relationships? What if it's the story of how we got back together?

Robin:
Okay, I'm gonna ask you one last time: is this what you want?

Barney:
It's what we both want. Why else are we rushing to tell them what we did - on a boat? That is a terrible idea.

Robin:
Barney, we tried this, and we failed! Why try again?

Barney:
Because I haven't stopped thinking about you and you haven't stopped thinking about me.

Robin:
I'm such a mess. Why do you even like me?

Barney:
[long pause] I guess, because you're as messed up as I am.