Thanks again for your opinion, but I have decided to let her go.
I have tried everything to get her back, even to transfer all the guilt onto me, but I just can't reach her. When we are talking and when I explain what I think, she understands everything perfectly and knows something has to be done, but the next day she forgets everything she agreed the day before.

For example: Last sunday we broke up, but the next day she called me to her friends birthday and sent me few messages saying how much she loves me. When I told her I can't do that, she agreed and didn't call me until friday. On friday, she was on a party with her friend and probably had few drinks so she called me again to ask where I was.
I tried to act uninterested and talk to her like with any other friend, but after that she called me few more times asking some "stupid" questions like. "Can you lend me some CD?" or "Can you tell your friend my friend is in love with him?" etc.
I have a feeling she was only checking on me to see if I'm with some other girl, becouse at the time I was out with my friends.

The next day she went on another party but I stayed home and sent her a message answering one of the questions she asked me the day before but she didn't bother to respond.

I have a feeling she's playing with my emotions, but I still don't know if she's doing it on purpose or not.
I try not to take this too personaly and I'm trying to remain cool on souch "provocations", but some of it still gets to me.

I mean. I finally manage to make some progress in effort to forget her and move on, but then she calls me and everything is back on the beginning.

Now I decided, I'll dictate the "tempo" of our communication. Until now I responded to each of her calls as soon as possible, but when I called her, she doesn't bother too much to respond or doesn't even respond at all.

Now I'll play her game and ignore her until she learns the feeling of not knowing where I am and what I am doing.

After all that time of thinking and cooling down I really don't know if this is the right girl for me. At least not yet. I know that deep inside she's a really good and sweet person but she obviously is not mature enough to see the real values in her seff and in people around her.

I know I was like her few years ago and my father had hundrets of talks with me telling me the same thing I was telling her, (like: "Think before you do something"),
but these talks didn't reach me until some point when I realised what he was saying.

Maybe she has to learn this on her own.