What Changed?

We used to be best friends
I thought it would last forever
but it's weird you know
how quickly things can change
I never wanted it to change
You guys knew all my secrets
You were always there
So where are you now that I really need you?
It feels like I've lost my sisters
You used to tell me i had so much to live for when i felt like giving up,
Told me that so many people out there love me,
Right now it feels as if I got everything,
except my two baby girls,
My sisters, my best friends
I think it's over
We can't go back to what we were
It's too late for that
It will never be the same
I know that but i still miss what we had
I miss you both
You touched my life in a way no-one else could
but time does change and best friends can become strangers
I never wanted that
I loved you both more than that
But I have no strenght left,
left to fight
to fight for what we had,
I lost it all in my fight for life
Believe me, I wish I could go back
Do things differently
Could have tried not to hurt you
could have tried harder
to have held onto what we had
I realise now that you guys meant the world to me
You still do,
I wish it didnt have to be this way
I want to hold you in my arms
Laugh like we used to
Tell each other our secrets
I want it to be like it used to be
but it never will be like that
So now i just want to know one thing
Then maybe i can get on with my life,
Please just tell me what changed?
was it me?
Is it all my fault?
I think it probably was,
I always stuff things up,
I don't care if it was, just tell me the truth,
I love you guys more than my life,
I'm sorry I let you down,
So sorry