Robin: You know, I got it into my head this week that you were cheating on me. I even broke open your briefcase to look for evidence.
Barney: That is a huge violation of my privacy! [Robin points to the giant projected image of her sleeping] Go on.
Robin: You know, in a way, I was right. You cheated. You can't get some crib sheet on dating me. That's not how it works. If we didn't figure out how to be with each other in a real, honest way, I don't see the point of even trying.