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.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.