Supergirl, Season 3

[Lena runs into Kara on an elevator, still unaware that Kara is Supergirl.]

Kara:
Alex tells me that you're helping Supergirl fight Reign. I'm sure she's so grateful for your help.

Lena:
Well... frankly, I am only working with Supergirl to save Sam, because I have no other choice.

Kara:
What do you mean?

Lena:
Well, it's that old adage: "Never meet your idols." You know? It'll only lead to disappointment?

Kara:
[subdued] Oh, yes.

Lena:
Supergirl's not all truth and justice like she pretends to be. You know, she had James break into L-Corp and search my private vault?

Kara:
.... I'm sure she had a really good reason.

Lena:
Of course, James didn't do it.

Kara:
Really?

Lena:
Well, no. We've been dating each other for months. He knows me and he trusts me, and I trust him. Supergirl went behind my back and used my personal relationships against me. That's like something my mother would do. She crossed a line. And I can never trust her again.