I think its about how "his girl" died and he thinks of commiting suicide but knows its not right. Hince the "walkin into a dream" he dreams of dying to see her again and realizes hes not supposed to be there yet. The second chorus clearly states that (at least it does to me!) . He wants to take the girl back to the livin with him and can't so he leaves her to carry on with his life and he'll see her one day for rea and wont have to leave again.