its Bella trying to get over Edward when he leaves (i figure you all know the story lol) and well she compares her (ex) vampire lover to an angel - her angel.
I made this video with the song "Stay Close, Don't Go" by Secondhand Serenade cuz i think it goes well with Twilight i hope you enjoy seeing as much as i did making it ^^ i'm sorry about the quality tho i'll try to do with a better one next time ;)