Every day, every night, or in every situation we say other materials or a person is our life. We say he is my life, she is my life, that thing is my life, this pet, etc. every little thing is my life. We put our life into some other things and when that thing or that person leave us we say that this life has now no meanings at all.
From the moment when they leave we start avoid ourselves. We ignore our presence.
Say for example:

Story 1
A boy or a girl used to love their lovers so much. But one day, for some reason one of them left the other one. And from that...