Don't be friends with her. The feeling will fade, I was in the same situation once and still kinda am. I was friends with this girl for 5 years, you will get through it :)
I miss my ex best friend even thoe she hurt me i still miss her and wanna be friends with her again but i really dont know what i should do because if she was a real friend she would not of hurt me the way she did but not in a violet way?
If you want to give it another go do so, but be aware that she is capable of betraying you, don't jump in to soon divulging yourself and making yourself vulnerable. Do something practical together so you are not rehashing old haunts, unless you feel there is something she can say that would help. Trust is earnt and she has betrayed that trust, it is going to be very difficult to go back to that innocence you had with her, your friendship may have to be on a different footing, say a practical one where she is someone you just go to the cinema with but do not discuss your personal life with.