After watching some episodes I saw when Carlin went to Evans house and they sing the song together. Carlin says it was written for her but it talks about getting your heart broken and loving again...who broke her heart?
So what was that random helicopter scene? I'm guessing that's how Jack dies, Rebecca was picking up his personal effects and that's when the house caught fire. Miguel heroically saves the family from the blaze and wins Rebecca's heart that way.