When Robin's latest beau decides it's a little weird that his girlfriend constantly hangs out with two of her ex-boyfriends, both Ted and Barney decide they want her back. This leads them to behave poorly—and drunkenly.
Ted and Barney's shenanigans prompt Robin to make a decision about moving in with Don. In the clip below, she tells them that she's taking the leap and won't be hanging out with the group anymore.
The pair don't believe her, but at the end of the episode we're shown her empty room. Personally, I don't see Robin staying away for long, and if anything I'm glad to see that Barney's declared his love for her once again. I am definitely team "Barney and Robin 4ever" so I'd like to see the two eventually rekindle the flame.