How I Met Your Mother, Season 8

[At Splitsville, Barney has witnessed Nick getting amorous with Robin again]

Barney:
She can't go home with you, Nick.

Robin:
Barney!

Nick:
Why not?

Barney:
Because Robin and I are in love.

Robin:
Barney, what are you doing here?

Barney:
Taking care of something you clearly can't do on your own. [to Nick] I'm sorry but you and Robin are done.

Nick:
What? Robin, what is this?

Robin:
Barney, look I know what you're doing, ok? Please stop.

Barney:
Robin doesn't want to hurt your feelings because you're a nice guy, but she thinks you're stupid and she hates you. [To Robin] You're welcome.

Robin:
Stop doing this!

Barney:
I love her, Nick!

Robin:
[stands up] But, he doesn't love me. He's just saying this because he's -

Barney:
I love everything about her, and I'm not a guy who says that lightly. I'm a guy who has faked love his entire life. I thought love was just something idiots thought they felt, but this woman has a hold on my heart that I could not break if I wanted to - and there have been times that I wanted to. [Robin looks at him] It has been... overwhelming and humbling and even painful at times, but I could not stop loving her any more than I could stop breathing. I am hopelessly, irretrievably in love with her. More than she knows.