Wait a second. How can you break up with someone you’re not actually dating? Well, that’s just one thing that happened in last night’s episode of “Chuck.”

I suppose anything is possible when you’re a CIA agent pretending to be the girlfriend of the person you’re trying to protect. Or if you’re a computer geek by day and a government operative by night.

Thing is, when Rachel Bilson joined in the cast as Lou, Chuck is immediately interested. And who can blame him? She does tell Chuck to look her up if he ends things with Sarah. And we all know he’s had a crush on her, and she hasn’t responded favorably to his advances, per se. But when he dumped her, you should have seen her expression… sad, sad eyes. I guess she was just doing her job when she lied to him.

Now, the question remains: is “Lou” really what she seems?