This is not going to hurt me at all

Why do I pretend that I'm so invincible,
When you make me feel so invisible,
And tell me why I keep trying,
When I know that,
You plus me is always,
Equal to ex,
No matter what I tried,
You'd still be walking off,
And if I tried to show you,
What I hold inside of me,
You just look at me and call me weak,
Don't you see that this is no game,
It's my life,
And in the end nothing would be held true,
Feel me course through your veins,
And scream out in anger,
I know you're as addicted to me as I am to you,
Sweet heart you have a problem,
And I can see the track marks,
You need to get me out of your heart,
Because its over,
Don't you see we were never meant,
To love like that,
I won't let you drag me back into those days,
Yes I remember,
All those smiles and laughter,
But what you don't remember is,
All those tearful nights and the times we destroyed eachother emotionally,
We were bad for eachother and I've gotten clean,
Your image no longer courses in these veins,
You just can not accept that its over,
I will show you though,
I know this is going to hurt you,
But it will not hurt me,
Just remember you were the one who walked away.