I like the idea of it being about mourning over a lost love but I think it might also be about someone, maybe a lover, who has changed from when they first knew each other. In this sense I think the 'ghost in you' is the person how they used to be and everytime he looks at her he sees who she used to be and so 'she don't fade away.' I'm not sure how the rest of the song relates to this, it might or it might not, but that was what I thought when I first heard this song. But I like and readily accept all the other interpretations people have made.
I like the idea of it being about mourning over a lost love but I think it might also be about someone, maybe a lover, who has changed from when they first knew each other. In this sense I think the 'ghost in you' is the person how they used to be and everytime he looks at her he sees who she used to be and so 'she don't fade away.' I'm not sure how the rest of the song relates to this, it might or it might not, but that was what I thought when I first heard this song. But I like and readily accept all the other interpretations people have made.