Clark and Lex in “Unfinished Business”

Clark

I know Lana. She's never been this serious about anyone.

Lex

You sound awfully concerned about that for someone who let her walk out of his life.

Clark

Yeah, I guess the whole "If you love them set them free" thing kind of backfired.

Lex

It's not about love, Clark. It's about what you're willing to do for it. On that field, you'll do whatever it takes to win, but if you're not willing to do the same for Lana, maybe she doesn't mean as much to you as you think.