That's a tough one. I can't say for sure as I'm not certain of the song's meaning. Reading over the lyrics on another site, it seems to me that either (a) the speaker is alive and his former love is dead or (b) both are alive but very distant. I suspect that the former situation is the case because I think the song's use of "miles" might really be a figurative reference to time.
If that is true, then I suspect that "leave their way" refers to other people dying and saying hello to the speaker's deceased love in some form of afterlife (or perhaps "saying hello" simply refers to people entering that afterlife or maybe it refers to greeting a deity). I don't know if my first interpretation is correct though. Perhaps there are some fan sites, or you might even consider sending an e-mail to the band or its representatives. You might just get a response directly from the source. :)
Student or Learner