Blair later tells Chuck to re-enter the building once everyone is gone, which he does, and it is revealed that Bart Bass is still alive. Bart reveals that he faked his death to save Chuck and Lily, and has been hiding from everyone for the past three years.

Why Bart Bass faked his death?

The next morning, Bart explains to him that he had to fake his death to avoid having the entire family murdered by one of his competitors. After the car crash he paid off one of the doctors to turn off the machines and pronounce him deceased.

Does Bart Bass return?

"Gossip Girl," "The Fugitives": Blake Lively as Serena Van Der Woodsen. Bart Bass is alive! He's ALIVE! ... Bart says someone tried to kill him and he pretended to be dead in order to protect Chuck and Lily.