Here's The Key

Here’s the key:
You aren’t hurting me.
I’m hurting myself
By staying on your shelf.
I never meant you harm
And you kept me on your arm.

Here take a look:
My name’s written in your book.
Not on your heart,
Not in a piece of art.
You’ll forget me quickly,
I’ll remember you eternally.

Here’s a hint:
Grab your flint.
Start the fire,
This is dire.
Burn the letter,
Sooner the better.

Here’s a statement:
This is my final judgment.
I wish it was this simple,
Grab a string and pull.
But that won’t happen today,
So that’s what I won’t say.