Listening To Otis Redding At Home During Christmas Lyrics

Lyric discussion by justone 

Cover art for Listening To Otis Redding At Home During Christmas lyrics by Okkervil River

When I'm listening to this song and "Do what you gotta do" I always get a feeling "Do what you gotta do" is that letter that girl, Sara, wrote to him... Also, "I came here to say I'm going away" fits into that story in my opinion... What do you think? DO that songs speak about one story of him and a girl he left when he needed to go?