This is how it works

Derek: You left without me. Oh, now you’re not talking to me. I was a jerk. Sometimes boyfriends can be jerks. That doesn’t mean you stop talking to them. You get that I’m saying “I’m sorry,” right?

Meredith: You yelled at me for no reason and then you walked away and now you show up here.

Derek: Of course I showed up. Why wouldn’t I? You don’t trust me?

Meredith: I do.

Derek: Okay, well, this is how it works. You fight sometimes and somebody apologizes.

Meredith: Well, how am I supposed to know that?

Derek: You’ve never done this before?

Meredith: No, I’ve never done this before.

Derek: Hmm. Okay. All right. Well, uh, this is–from now on, you can expect that I’m gonna show up even if I yell, even if you yell.  I’m always gonna show up. Okay?

Meredith: Okay.
(They kiss, and hug each other.)
You are gonna make an excellent chief.

Derek: Yeah.