Just forgive her and move on....you'll surely get over this in some time.
Always remember to never keep any hard feelings against anybody...that's the best thing u can do for them and for yourself.

Love & care,

Lilac

Sounds like you can't live with her but you can't live without her. You must change you mind set to move on from this situation. Cutting a cord with a golden pair of scissors is all very well if you have the concentration and will power to do it.

In my humble opinion you should focus on the positive things you have in your life and build relationships with others. In time you will move on from this place you find yourself in.

Remember life is for now and the future, there is nothing to be gained by living in the past.

Thank you for your advices,

tunaf15h,
The problem of writing that letter would be that I know that she has made me feel great much more times than awful so I think if I remember the good things I would only get things worse as I could miss her again, anyway thank you for the advice. I know time (and other girls) will heal me.

lilac,
Guess you are right, I know if some time would have passed and I would be with another girl feeling great again, I wouldn't waste energies in hating her instead I could eventually thank her for leaving me. I know that day will come but until then I want to be "free" for some time have some fun, too bad I'm not too good at flirting.

Edwin Temple,

Don't worry, I know I will have to live without her the rest of my life, it was great while it lasted but it ended, end of the story. I guess my worst problem is the incapacity to understand how a person can change her feelings towards you so suddenly and I'm not talking about love now, I'm talking about friendship, how can you be a good friend and two days after you mean nothing at all to that person. But that's not for me to suffer anymore, the ones who are with her will have to deal with that not me.

About focus on the positive things I have in my life right now, well... better not, of course things could be much worse but I don't have nothing that makes especially happy right now, I mean I have little things here and there but nothing I can say: "I really I'm wishing "this" to hapen this day of the week." or something like that, only the perspective of a better outcome with some interesting ideas helps. That's why living in the past was such a big temptation, because I know it will still take some time to get with other person what I had with her, let alone exceed it.

Anyway, thanks to all again and don't worry I'll get over this, I know I will.

things will get better.  remember do not settle for medocricity.

hating when u feel like it
and forgiving when u feel like it.
both will do. express ur emotions.