"What does it matter?" Meredith asks, almost pleading for him to drop it. "It's back now. I am wearing the ring. I'm going to keep wearing it. I was angry and you weren't listening and I did something rash, but it's over." There's more to it than that, but she's eager to end this, irritated to have to talk about it now. There's nothing wrong with what she did and she doesn't understand why he thinks she should have to be sorry about it, although she'll apologize if it'll end this ridiculous spat.