He's telling her that he'll always be with her. When she dies, he's going with her. She will never be without him. Like in the lines, "You and me, have seen everything to see, from Bangkok to Calgary, And the soles of your shoes, Are all worn down, the time for sleep is now, it's nothing to cry about, Cause we'll hold each other soon,In the blackest of rooms," saying we've done everything we can together and when something happens to you, don't cry when your about to go, cause i'll be right there with you. And in the lines, "If Heaven and Hell decide that they both are satisfied,Illuminate the "no's" on their vacancy signs,If there's no one beside you, when your sou embarks,Then I'll follow you into the dark.Then I'll follow you into the dark." Even if Heaven and Hell don't decide either of us. We will be together in the darkness of death, but that won't matter cause we'll be with eachother forever. This song is an amazing song. It's so sweet and very deep. Love does powerful things to you, no matter what happens, they'll be there.