This begins Lily starting to distance herself from Bart and grow closer to Rufus, despite Bart asking her to give him a chance to change.
You just happened to find yourself in this neighborhood? Shocked, they flee the wedding to track him down.
He promises that Andrew was a happy kid who loved life; but it's later revealed by the adoptive mother that Andrew wasn't their son and they would never share their real son with them due to being scared of losing him.
Serena then sees a photo of herself on Gossip Girl doing cocaine, not knowing it was really pretending to be her to ruin her reputation.
They make amends and begin acting civilly again.
Thinking he cheated, Lily brings him the scarf and they reconcile later that night.