Vaziri, Arastoo Cam marries Arastoo Vaziri in "A Day in the Life," and later informs Brennan that she is considering passing over her administrative post as Head of the Jeffersonian to someone else. When asked who, she replies, "Him." This indicates that they have some sort of a relationship where they can share their feelings with each other. Also, according to IMDb, this is the first time that Brennan and Cam meet. So it can be assumed that they have some kind of a history together or at least know each other from before. This is just a theory though so don't quote me on it.