That's pretty much all we got. Blame Jack. It shouldn't be too hard.
EW's Michael Ausiello answers a reader question in his spoiler mailbag today with a simple explanation of why Chuck and Blair evidently hit the skids later this season.
His take on the bombshell breakup to come when the show returns ...
Q: Could you give us more details about Blair and Chuck’s break-up on Gossip Girl?
A: Blame Jack Bass. It’s all his fault.