I could stay away forever if I tried

Well you say that I treat you like a book on a shelf
I don't take you out that often 'cause I know that I've completed you
And that's why you are here, that's the reason why you're here. How awful that must feel. You said you would be my dream, I could have you every night and if, by morning, I'd forgotten you, well, that's ok, it'd be all right 'cause you are the reoccurring kind.
You never really leave my mind. Are you the love of my lifetime? 'Cause there's been times when I've had my doubts. We were just kids when I first kissed you in the attic of my parents house and I wish we were there now. It took so long to figure out, what this book has been about. Now I write when I'm away letters that you never read. You said go to explore those other men, the geography of their bodies but there is just one map you'll need. You are a boomerang. You'll see, you will return to me. You will, you will, you will, you will, you will, you will.
'Cause if you don't, then this book's all lies
If you don't, then my plans would all be ruined
If you don't, I'll start drinking like the way I drank before
And there just won't be a future anymore.