I like it. It has a sad and angsty feel to it and I can relate to it in some ways. I can feel the emotion flowing off of every line. This person left you behind...now you're going to leave him behind.
I like this part of it alot.
"I'll hide away
In the back I promise to stay
Silent and smiling
But deep inside I'm crying
Once again you've left me behind
Maybe someone should to to you in kind
Forgoten again"
You most likely don't want to show that you're crying. You have to be strong for you're own sake...