What is the meaning of Dead Stars in Dead Stars by Paz Marquez Benitez?

In "Dead Stars" by Paz Marquez Benitez, the main character, Alfredo Salazar was engaged to Esperanza, but his love had faded. He met and became fond of Julia Salas, but married Esperanza as planned. He never forgot Julia and ran into her on a business trip. He found that he didn't feel attracted to her anymore. He compares the memory of his love for Julia with dead stars. The leftover traveling light from dead stars can still be seen for many years after the star is gone.