Smallville, Season 5

[discussing Clark pulling away from Lana]

Lana:
It just feels like you're afraid to touch me anymore. Did something happen? Clark? Okay, is this where I have to remind you that you're the one who said we wouldn't keep things from each other?

Clark:
Why is this about me? I mean, you're the one that pulled away first. You moved to Metropolis two weeks after we got together. And now you spend every moment with these books. Why astronomy?

Lana:
It's homework.

Clark:
It's an obsession. And that thing about honesty? It works both ways.

Lana:
Nice deflection, but I don't fall for that anymore.