My last goodbye

Let me know please? Please tell me....
Why??
Why did you just cast me aside like used paper that you were done with?
I've been there for you, through everything.
When your world was falling apart I was there, even if mine wasn't stable.
When you needed someone I was there, holding you because no one else would, no one else did.
The tears fall with every memory, every step that I watched you take,
I watched you take it without me.
I let you have your space, let you have your time all to yourself when you asked me,
I never questioned you nor got mad at you when you yelled at me or got angry at me,
for no reason.
When you needed me I was there, no matter if my world was breaking and crumbling,
I made sure that yours was steady and that you could walk on steady ground.
I made sure that your day was bright
Even when mine wasn't
I was there for you
Through everything that I could possibly be there for.
Yet you never trusted me;
Never once believed in me.
Never.
But you lied straight to my face
And how I ever believed you
is still hard for me to believe.
I gave you more than I should have and
This is how you show that I mattered,
By throwing me away,
Because I made one mistake?
Unbelievable.
It's happened before, you throwing me away
But never this bad.
Every other time I took the time to make it better, "fix it."
Not this time.
I can't bare it again. Not the pain that follows.
I took the time to think it through and though I feel
Like I have lost a battle that I should have won,
I feel that it is going to be less painful to just say
Goodbye for the final time.
If I try a to "fix it" I will get thrown away again,
And we may end up as enemies.
I have decided to not try to "fix it" and
Remember the good times that we had
So that I don't end up hating the one person
That I have had so many good memories with.
I would rather be in pain remembering the good
Than being in pain trying to forget the good.
I could take a million physical punches better
Than I could take the pain that you are causing me emotionally.
I have to tell you one last thing
Thank you.