I'm here to stay

God put me on this world,
And he can take me away,
But once I met this girl,
I knew I was here to stay.

We use to talk every night,
We’d talk ourselves to sleep,
And wake up to the morning light,
That feeling I long to keep.

She’s long since left me,
And I’ve done nothing but think,
Was her leaving due to me,
Or did her feelings from the beginning do nothing but sink.