Speaking unscientifically, if a cat has nine lives or Voldemort had 8 lives you can think about your entangled similar life elsewhere as eventually winking out in a way that you can almost feel. "Not tonight honey, I feel like I've died". :^/

Scientifically, String theory gives rise to an 11-13 dimensional space and structures that can build the smallest subatomic structures.

on the other hand

A Universe capable of reproducing other universes/multiverses, each with its own separate spacetime, gives rise to a possibility of building a similar you someplace else. Some think the 'womb' of these new universes lies at the center of super massive black holes where energies are beyond understanding.