The comic I read:
Marten knows Dora is remorseful because he can see her sitting on the couch, curled up into almost a fetal position and looking doleful when he walks in, as opposed to how she looked when Fay burst in on her (I say this for you to contrast—Marten doesn't need to see the other, having experienced the times when Dora was sure she wasn't wrong). Also, he might have a clue by her asking "Are you gonna break up with me?" That's an admission of guilt and more—it puts Marten in the driver's seat, because he gets to decide what happens. That's submission, folks.
Then Dora apologizes, and Marten accepts—more submission. I think Akima's right, some of you just won't be satisfied without a good grovel. But it's very clear to me who has 'won' (I'll also remind you anyone who has to utterly win an argument with his or her SO better really enjoy winning, because that will, sooner or later, be all they have). Marten accepts—that's what 'it's okay' means—and immediately attaches a condition for continuing the relationship. Then Dora further acknowledges she was wrong by asking if Marten is 'mad' at her. This is an admission that Dora thinks Marten has a right to be angry, and perhaps that why he's not mad is nowhere near as important as the fact that he's not. That's enough for now.
Then the joke, because, again, Marten loves Dora and wants to keep her more than he wants to win. But I don't think the words "full disclosure" are chosen by accident.
Ladies and gentleman, entities and beings, Marten has clearly 'won' and is in control. At the same time, he's showing Dora how unlike those other assholes he truly is. An Alpha-Goth Grade-A asshole, I'm guessing, would need a grovel, and I don't want to think about what else because I'll start foaming at the mouth, and I already replaced one keyboard this month. And if you need to know how to win an argument with the person you love, this is it. You don't crow, you don't require utter submission, and you make sure it's understood where you want things to go from here without being a tool about it. I don't know if it's well known, but a person in a position of strength shows it by being magnanimous. It's the precarious weakling who requires the genuflect.