the relationship ended in "bury your dead".. but the problem began when jeanne found out that tony was an agent and had lied to her all the time thay had been together. when she found out she was obviousl upset and reacted like anyone would. jeanne did give tony a chance when she left him a note saying "im not coming back, you need to choose" amd this tony read while sitting by a fire then he looked up at ziva in and they stared then he threw the note in the fire and joined his team laughung. even though it was really over then jeanne came back and tried to blame tony for the murder of her father, "the frog" and she soon dropped them . but when tony and jeanne were talking at the end of that episode she asked him was any of it real and he answered no. that was when it was really said and done even though at that point i think he still loved her. she is a doctor in a third world country when she left.
Jeanne Benoit broke up with Tony after he revealed that the initial relationship was part of his undercover assignment. The last of their relationship was Season 5 Episode 1 "Bury Your Dead" where it was thought that Tony had been blown up in a car bombing. She did return for one episode, "Internal Affairs"(S5. EP14), but it only served as a finalization of the fact that they were going to stay apart.
For what happened to the girlfriend.. first her name was Jeanne, the she found out that Tony was undercover and since his identity was fake she though that the love was to! :( The name of the episode that things stated going bad for tony were the season four end angel of death and the first episode in season 5 bury your dead. Tony made his final desision in season 5 episode 2 family.. he chose the team over her.
It was the first episode in season 5: bury your dead I think it was called but he didn't stop thinking about her until the second episode of the season titled family PS; I hated jeanne benwa tony is much better of with Ziva damn rule 12
It ended in 'Bury your dead' when Tony's alias' car was blown up in the street. She believed that he was a media studies professor called Tony DiNardo, as part of his undercover assignment to gain information on her father, La Grenouille (the arms dealer Jen was after) He was never meant to fall in love with her. It ends after the explosion when she asks him whats going on and he makes the decision to tell her that he is infact Anthony DiNozzo and he works for NCIS. He partially does this when Grenouille says that he hopes he will not break his daughters heart and gives him 'the look' to say that he knows who he really is. She appears again in 'Internal Affairs' when she tips the FBI into the idea that she saw an NCIS agent in Gibbs' team kill her father on the boat (she blames Tony obviously). This is all lies of course and when she asks to speak to Tony a second, he is unsure but Ziva says to do it, she is right behind him if she tries anything. Jeanne then asks him if any of it was real and he replies no. This is the first major hint you get about Tony's love for Ziva.