It isn’t just that Chair was endgame. I mean they didn’t exactly have an epic arc this season.
But they got their two other precious OTPS :
1. DAIRSTRUCTION - Dair and Destruction. Also known as DAIRNIAL - Dair and Denial. Dair never even happened - Blair loved Chuck and Dan loved Serena. It was just a random hookup and meant nothing. Less than nothing.
2. DANMILIATION - Dan and Humiliation. They had dark, evil Dan who got punched and slapped around all season. But guess what, he deserved it, cause oh my gosh he’s so like poor ! And he’s judgemental and evil and OMG he was Gossip Girl all along.