What happened to us?

I often think, I do not understand what is happening between us.
We were very close friends and we were best friends many
  years, and I thought it would be so life
  out, but .. apparently not
Are you mad at me? I have done something?
It feels like I've done something wrong but do not know what, you do not respond to my income, when I call you or when I am writing to you on MSN.
I want to know what happens .. I am trying to contact you but you do not care, is it so?
I want to know what has happened, is there anything I have done so say it to me instead of ignore me.
I miss when we were really close friends, we could talk about everything ..

What happened?