This song is a downtrodden, heart wrenching tale of losing someone you deeply loved for years, who once shared your bed but now haunts it. A meditation on the mental effects of grief, think Mount Eerie's A Crow Looked At Me. It is also a reflection of the narrator as much as it is a reflection on their relationship. Like the way losing one you consider your "better half" can make you want to stare in a mirror for a time, checking to see if you're still all there. The part where is reads "Sorry Charlie" is an obvious reference to Charlie Sheen's "Tiger Blood" era, commenting on another form of mental disorder altogether and admitting to the lack of energy or fortitude to deal with these things(the haunt) with similar gusto. This song probably won't make for easy listening, but you perhaps could forge a somber piano ballad out of it, with muffled or bluesy guitar sections separating the verses, and it would probably help if you can really sell the vocal delivery in a personal, intimate way. Or use a good deal of reverb, emphasizing the distanced, alienated place that the narrator's head is at. But that's just are off the cuff suggestion. This is the kind of song written not out of artistic ambition per se, but an extreme need to exorcise the demons of a tormented psyche. I hope you find something in it that moves you, albeit in a gentler way.