Not Even as a Friend

this is written to a girl who cheated on me=/ Please critique

You say I should forget
And you should be forgiven
But you're the one thing I regret
And i just keep reliving
What you've done
I used to wanna take the gun
But I held back
And now life is back on track
I don't need you to do it again
So now I can never like you
Not even as a friend