The Thin Line Between Chuck and Nate

Plot:

Gossip Girl reports that Serena van der Woodsen was seen buying pregnancy tests. Of course, on the Upper East Side, the truth is often even juicier and more scandalous than the gossip. Nate finds out about Blair and Chuck's affair. Everyone else also finds out what happened and Blair's life comes crashing down. Dan struggles to tell Serena those three words.