Because, before we weren't together.
Harvey: I couldn't help but notice you didn't come over last night.
Donna: I know.
Harvey: Did you also know that's the first night we haven't spent together since we got together.
Donna: I didn't know how to make sense of you taking my side with Louis when you didn't agree with me.
Harvey: What do you mean? I thought you would like that.
Donna: Well, I don't. I don't want you saying things that you don't believe. And I want to know why you did it.
Harvey: I guess, because, I was afraid you'd be mad at me.
Donna: Well, that's never stopped you before.
Harvey: Because, before we weren't together.