"
My seat's been taken by some sunglasses
Asking 'bout a scar
Both wrong. They are lovers. She obviously was waiting for him to show up. Was late. And some GQ, Joe-cool, sunglasses wearing (metaphor) dude is now talking to her and she's telling him about how this guy has hurt her months ago. The following verses explain how he's tripping over himself trying to take it back, and will carry her home because he owes her that.