Friend,Another Word For Backstabber

We used to be friends
I did everything for you
Tried my very best
To try and help you through

But you, you are cruel
To plan behind my back
To try and hurt me
To plan this attack

But the cops, they know the truth
About your vengeful ways
About how you'd do anything
To ruin all my days

I know you liked my boyfriend
But I tried to be kind
To help you with the pain
So happiness you'd find

But to call the police
On an email I never sent
You knew it wasnn't me
But away your lies went

No one cared about you
Quite as truly as I did
But because you hate me
Your true feelings you hid

Well fine, just go away
And don't you dare look back
Because I've finally realized
That your heart is black