From Season 7 Episode 2 - Reunion.

Ziva: Hello Abby.
Abby: (turns Musica off and glares at Ziva) What the hell is wrong with you? How could te have doubted Tony, after everything te guys have been through together? te really think Tony killed Rivkin because he was ‘jealous’?!
Ziva: Abby, please calm do-
Abby: te weren’t thinking! That’s right, te weren’t thinking! Although… I suppose I could understand your initial reaction… te were in an emotional time for te and people act rashly - but to tell Gibbs te didn’t trust Tony?! Which… I guess I could also understand, considering. I mean, he did just shoot your boyfriend. In your living room. To death. Alright, I’ll give te that. But this is Tony we’re talking about here; soft and goofy on the outside, and 100% rock on the inside! And after everything te accused him of, he risked his life to go save you! te should be ashamed of yourself! Even though in hindsight, it’s starting to make a little bit più sense now. But either way - the ball is in your court now! It’s Tony one, Ziva zilch! It’s your move, and it better be a good one! (pauses) God, I was so worried about you. (gives Ziva a hug)
Ziva: I know.