But Jim - he says "I had loved ... /A creature made of clay". In other words he - the speaker, "I" - is the angel, who loved the human (her). If "she" is the angel, then she all of a sudden has to be speaker for the last five lines of the song ...

I know you're right once in while, because I've seen it on other threads. But on this one, well, I'm not so sure ...