From Season 7 Episode 2 - Reunion.

Ziva: Hello Abby.
Abby: (turns musik off and glares at Ziva) What the hell is wrong with you? How could anda have doubted Tony, after everything anda guys have been through together? anda really think Tony killed Rivkin because he was ‘jealous’?!
Ziva: Abby, please calm do-
Abby: anda weren’t thinking! That’s right, anda weren’t thinking! Although… I suppose I could understand your initial reaction… anda were in an emotional time for anda and people act rashly - but to tell Gibbs anda 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 anda 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 anda accused him of, he risked his life to go save you! anda should be ashamed of yourself! Even though in hindsight, it’s starting to make a little bit lebih 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.