I love love love this song :)
Pretty self explanatory if you ask me.
She knows she's being cheated on by her guy hence "The necklace in your car that wasn't mine"
and lets him go so easy that even if he were to come crawling back for her forgiveness she's already moved on and he has "nothin' on her." There was no emotional baggage left behind from her goodbye, everything was left behind and she's done with him.
I love love love this song :) Pretty self explanatory if you ask me. She knows she's being cheated on by her guy hence "The necklace in your car that wasn't mine" and lets him go so easy that even if he were to come crawling back for her forgiveness she's already moved on and he has "nothin' on her." There was no emotional baggage left behind from her goodbye, everything was left behind and she's done with him.