Supergirl, Season 5

Lena:
When I came to this city, I promised myself that I would never trust anyone again, and... then I met you. And you chipped away at my armor with your warmth and your earnestness, and you convinced me to trust in people and friendship again, and against my better judgment, I did, all the while telling you about my Achilles heel, betrayal. I confided in you that everyone in my past had betrayed me. About how much it hurt to have someone you love lie to you and betray you. I spelled it out to you over and over again, essentially begging you not to violate my trust, begging you not to prove that, once again, that I was a fool. You reassured me ad nauseum that you would never lie to me, that you'd never hurt me. And all the while, there wasn't a single honest moment in our friendship.