Question: What was the first released single on the self-titled album released by an American country artist whose second single was co-written by Taylor Swift and released on December 1, 2008?
Sentence (from "Best Days of Your Life"): The song is about a narrator explaining how her former boyfriend cheated on her and moved on to a new girlfriend to start a family with, wishing them well on their new life but says that the new girl won't top what they previously once had before.
Relevant evidence: Yes