Answer:
What goes up let's of a load and come back down
I have joy in bringing two together, but darning my existence! My life hangs by a thread, filled with ups, downs and resistance!
The negative hero in each story
Mostly worn by women or girls, this is sometimes shiny like silver or gold, and sometimes it is made of pearls.
Some keep it in a dumpster while others keep it in their trunk.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?