At a certain point, as a universe expands, the distances become too great for relationship, for cohesion and connection, for objects to have influence on each other. In that environment, cause and effect dies, and consciousness cannot grow.
The distance between incarnate souls, as that between stars, is subject to strict laws of entropy. The distance between souls will expand, due to cruelty and damage, until there is a complete loss of relationship, of connection, of influence. Such souls are then alone, flying like some lost planet through the dark.
The distance between souls expands as cruelty breaks attachment, as it destroys emotional gravity. I that environment, consciousness can no longer grow because love is impossible.