Felicity spies Blair kissing another girl in the library. Felicity plans to tell Elena, but keeps quiet when the girl turns out to be Elena's best friend, Tara. Blair tries to convince Felicity that he wasn't even at the library. He and Tara later confess to Elena, but claim that it was an accident. She is still mad, but elects to forgive them. Felicity talks with a guy with a photographic memory who frequents the library stacks. He has seen Blair and Tara make out on several occasions. Elena refuses to believe that Tara would betray her, and essentially orders Felicity to stay out of her business. She soon has a change of heart and backs out of a date with Blair, but tells him to go to the concert alone. She apologizes to Felicity, and they wait for the concert to let out. They discover that Blair gave Elena's ticket to Tara, whom he kisses outside the arena. Julie learns the identity of her birth mother, Carol Anderson. Ben comes along for moral support as Julie prepares to meet
Elenco: Keri Russell , Ian Gomez , Amy Jo Johnson , Amanda Foreman , Greg Grunberg , Tangi Miller , Scott Foley , Scott Speedman .