You used to be a challenge for her. You had a very high significance and she was initially irresistibly drawn to you. Now she's gone and you are saying: "I want my ex back!"
I'm going to make a wild guess here, however is it that as time went on, you started to be less and less of a challenge for her? And is it that now, you might be absolutely no challenge for her? And that she understands that if she wanted to, at any time she could easily get you back again and wrapped around her finger just by saying the word?
I'm going to be a bit crude here, nevertheless as you know, to develop into a challenge again you must show to your ex-girlfriend that her sexuality has no control over you any longer. Consider what it's like when you're stalking her with not returned phone calls, voice mails, text messages, and emails. After which think about what it is like when you keep on doing it (as many guys do) even after she's told you to stop. You are suggesting to the woman that you're a low-value guy without any other sexual alternatives.
Your lover will not respect you again until you reject her sexual influence over you. Fortunately you are doing that now by not personally corresponding with her. The last thing she needs to hear from you now is how much "I want my ex back", so stay away from her.
Be sure you stay 100% rigid with your communication cut-off. Be careful not to be "buddies" with her, because that rewards your ex with the ongoing validation of power over you while giving her a handy justification to stay broken up. (She reasons that she is letting you down easy that way, assuaging virtually any remorse she may feel.)
However, always keep her locked in with the help of your stuff. Probably a lot of your possessions are at her residence, and vice versa. She could even owe you money as well. She might request a mutual friend of yours to ask you if you would like everything back.
The very best response to this is simply "No, not yet. The justification is simply because her holding onto your things (and you possessing hers) is still locking the two of you in and ensuring future communication. You do NOT want to give her the psychological closure that would come from settling your accounts.
For the up coming 3 weeks, you must totally accept -- and embrace -- the fact that you're an independent man now. Take what took place with your ex-lover and learn from it. You have a wonderful chance to transform your life which will eventually allow you to get your exgirlfriend back.
