when do chuck and blair get into a car accident
Riding in Town Cars with Boys Blair Waldorf (Leighton Meester): Blair does not hide her conflicted feelings as she comes to realize that there is a possible ending with Chuck in it and not Louis. She tries to stay away from going for Chuck, but she cannot help it. At the end of the episode, her and Chuck get in a car crash due to over-active paparazzi. She survives the crash.
Jenny Humphrey Jenny has been living in Hudson with her mother since May. Blair finds Jenny preparing for an interview with Tim Gunn, and grants her a special day pass. When Chuck steals Jenny's portfolio, she is forced to visit The Empire Hotel, where Blair had forbidden her to go. This results in Blair and Jenny scheming against each other, and Jenny eventually telling Gossip Girl that she lost her virginity to Chuck, not Damien Dalgaard. While Jenny is left feeling victorious, a defeated Blair blames Chuck. Jenny ultimately realises the damage of her return and decides to leave for good, telling Blair and Chuck that their vindictive games against each other will soon destroy them both.