Lyric discussion by Darlo 

Cover art for Dust lyrics by Fleetwood Mac

When the white flame in us is gone And we that lost the world's delight Stiffen in darkness. Left alone To crumble in our separate light When your swift hair is quiet in death And through the lips corruption thrust to still the labor of my breath

i think this is about a relationship that has left the two lovers broken and depressed and they are both left alone to suffer