In the first episode of season 1 , he already knew, but they did a flashback episode last year of how they met and how she told him. But I can't seem to find the episode, it's either in season 2 or 3 but more likely 3.

Edit: I think it might be season 2 episode 8 The Night we Met

Edited By: Kamadzea 12/15/2008 9:04 AM. Edited 1 times.