Awww...I read this and I instantly felt for you.
I have had a similar thing happen to me many moons ago, and it is a really heard place to be
Just a few things that might make things easier:
1. She doesn't want to be your friend. She said this cause she knew how upset you would be. She said this because she didn't want to feel guilty about splitting up with you
2. I personally don't believe that you can have a friendship after an intense relationship, mainly cause there will be one person who will always want more than friendship and they will be settling in the vain hope that they will get back together.
3. Please don't contact her. If she feels the way i think she feels, she will not want to hear from you for a while. When i contacted ex boyfriends after we had split up and we were "just friends" I hardly ever got a reply, cause they didn't really want to hear from me. Plus the head f*ck you have to go through while you wait for a reply from them is horrible...don't get me started on when they don't reply at all...
I know most will read this and think "oooh that's a bit harsh" but in the experience I have had this is mostly 100% true.
As much as you felt for her, she cant, wont or doesn't feel that way about you, but there is someone who will feel like that for you, and hopefully you will find that person and i really really hope that you both feel the same for each other
And one final point, you have us! Internet friends are great, cause they cant judge you from face value, so you can speak to us in your darkest moments and we still wont judge you