Lena and Kara in “Unfinished Business”

Lena

Let me guess. You're here to tell me once again that I should forgive you. Or maybe that I shouldn't work with my brother?

Kara

Not this time. I recognize I made a mistake in hiding my identity from you for so long, but the past is the past, and I can't change it. Forgive me or not, that's your choice. Just like it's your choice to work with Lex. I'm done blaming myself for your bad decisions.

Lena

Then why are you here?

Kara

To tell you that from now on, you're accountable for your own actions. If you decide to forgive me, I will be there for you. But if you continue to work with Lex, if you go through with whatever it is the two of you are planning, I will do everything in my power to stop you. Just like I would any other villain.