A Truthful lie

I am death

It was simple
Or so we thought
Kill them all
Then walk off
But that didn't happen
Sadly said
You fell in love
Then fell dead
That's my fault
I have to say
Without me
You'd see another day
You'd never admit
But I know it's true
Life without me
Would have been a dream come true
I am death in a girl
You pretend to not see
But death seems delayed when your away
From me