Ne Me Quitte Pas

7 years ago: Elijah has left New Orleans and has no idea that he is a vampire. He meets Antoinette in New York and she takes him under her wing. Marcel finds Elijah and tells him to leave the city. Elijah hunts for Marcel to discover his true identity. Afterwards, he goes to France to find Antoinette.

In the present: Elijah and Antoinette are still together and playing piano in a bar. He proposes to her and she accepts. Klaus confronts Antoinette and compels her to leave Elijah. She has been taking vervain and tells Elijah the truth about Klaus. Klaus tells Elijah who he really is and asks him to return to New Orleans, but Elijah repels him, breaking Klaus' heart. He works out that Antoinette has known who he was all along but he still wishes to marry her.

Plot summary from Wikipedia (CC BY-SA 4.0). Source