How I Met Your Mother, Season 4

Barney:
Ted, I have to tell you the truth. I'm in love with [sees Robin] tacos. What are you doing?

Robin:
I'm, uh, taking out the triz-ash. If you're, uh, looking for Ted, he left. Our little arrangement is, uh, over, by the way.

Barney:
Really? That's aws… ful.

Robin:
Awfsful?

Barney:
Yeah, it's just awfsful. What happened?

Robin:
Ah, he just insisted. He said he couldn't do it anymore because "someone's gonna get hurt." Think we all know who he meant by that.

Barney:
Do we?

Robin:
Isn't it obvious?

Barney:
Is it?

Robin:
Yeah. It's Ted. You know what a romantic he is. He can't separate the physical from the emotional. He's all like…

Barney:
I love you.

Robin:
Exactly. He's not like you, you know? Besides, we're friends. I don't want to screw that up by getting involved. Dating friends never works out. So, uh, you want to get a taco?

Barney:
A taco?

Robin:
You love them, remember?

Barney:
Right.

Robin:
Come on, I'm hungry.

Ted:
(voiceover) So Robin and I went back to just being roommates and things went back to normal. Your Aunt Lily was right: when two exes decide to just be casual, someone always gets hurt… it just wasn't one of us.