Ziva: (about his mother) How come you never talk about her?
Tony: I don't?
Ziva: No. No, you don't.
Tony: Hmm. Well, I guess, uh, she was the first woman to break my heart, and I don't like to talk about things like that.
Ziva: You don't like to talk about it because you don't want to. Maybe it causes you too much pain.