When Bellamy is coming back to the camp after having freed the 100, he knows what Clarke have done in TonDC. His sister told him. He wants to understand why she did it:

-Clarke, we need to talk.

He takes Clarke's arms in his hand without waiting for and answer and go to a room where they can be alone.

-Clarke! Why have you done it? Octavia was there! She could have been killed! I know you knew that the missile was going! I'm the one who've told you! he scream angry.

Clarke have tears in her eyes when she answer:

-I'm not sure that I knew what I was doing Bellamy. You were'nt there,with me, and I was becoming crazy! I send you in Mount Weather because Lexa told me, after Finn's death, that love is a weakness. And I believed it. So I needed to send you far from me. Because you were my weakness. But, the truth is that when you're far from me, Idon't really know what I am doing and what I have to do... Now I've understood. Love is maybe a weakness for Lexa, but love is my strengh. You are my strengh Bellamy. And, for do what I have to do, I need you here, by my side. Please Bellamy! Tell me that you can do that. I don't care to know if your feelings are the same than mines. I just want to keep you by my side for the good of our people.