In my sole opinion, it sounds like the guy is stuck in a relationship, or maybe even more possible, a marriage that he doesn't want or shouldn't be in, so he feels like he is trapped. It could even be with a girl who has a past with many other guys (fallen kings). The guy feels used in a way, whether financially or emotionally, maybe physically (I am the ghost she passes through). The overall meaning of the song comes down to the guy trying to figure everything out in the situation.
In my sole opinion, it sounds like the guy is stuck in a relationship, or maybe even more possible, a marriage that he doesn't want or shouldn't be in, so he feels like he is trapped. It could even be with a girl who has a past with many other guys (fallen kings). The guy feels used in a way, whether financially or emotionally, maybe physically (I am the ghost she passes through). The overall meaning of the song comes down to the guy trying to figure everything out in the situation.