The vows used are real vows (RCC) although at a real wedding, the bride and groom repeat the entire promise, not just say 'I do'. I couldn't see Lois actually making her way through the 'repeat after me'.
As to the breaking of the soul bond - I always thought that Asabi was simply feeding Luthor's madness with the story of murder breaking the bond.
In soul transmigration theory, even murder would simply be another learning experience. 'Breaking' the bond would only be by mutual agreement on a 'soul' level.
