when does barney find out who the mystery girl is
Everything Must Go (How I Met Your Mother) Barney is plagued by the mysterious woman who has been informing his conquests of his true intentions, leading to a slap from whomever he is attempting to seduce. He is onto the saboteur and follows her from the bar and to a taxi. He discovers that it is Abby, Stella's secretary, who is in love with Ted and who had a one-night stand with Barney.