New Directions forget Kurt in New York after Nationals. Kurt calls Blaine who has his brother Cooper take Kurt home for the night. Burt blows up on Mr Shue. I think Kurt quits ND.
Anything else like this please share
The previous post reminded me of similar story where Kurt leaves the hotel New Directions is staying at, for Nationals, to visit Cooper. I'm not sure why he left the group; he might have been upset by them, or maybe felt (or actually was) a little abandoned? Will sees Kurt get into a taxi with a man Will doesn't know (who turns out to be Cooper) and decides to follow him, assuming Kurt was going off with a stranger.
I don't remember too many specifics but does it ring any bells?