Smallville, Season 3

Pete:
Clark, he knows your secret.

Clark:
I can't let him turn Lex into a vegetable just for that.

Pete:
You can't trust him.

Clark:
And you've never given him a chance.

Pete:
And you give him too many. You think it's easy keeping a lid on your secret? I've got to think about it every time we're around other people to make sure I don't slip. I've got to remember to say "meteor rock" instead of "kryptonite." And I always got to cover your unexplained exits.

Clark:
Pete, I'm sorry. You've never said anything.

Pete:
Clark, that's not the point. The point is that I got your back. But Lex won't.