After he has ditched you all you seek is revenge. However, revenge will hurt him but will do you no good. You need to look for a solution where both are winners and there are no losers. After all you once loved this guy. Here is what you should do so that he wants you back after having rejected you in the first place.
You need to make your point
Before you embark on your expedition you will first have to find out the real reason for rejection. Was it that he felt he was over qualified for you? Or, was it that he didn’t consider you pretty enough for a long term relationship. Find out the real reason and work on your shortcomings to make your point. It might take some time but you still have to do this.
Remain cheerful
When you are able to get back your confidence you will have to start socializing once again to keep you occupied. Make sure that whenever he comes face to face you are happy and cheerful. Hit the dating circuit if you need to but be happy and let him know that the rejection did not affect you one bit.
Snub him
You are likely to meet him sometime or the other. As and when that happens just look through him and do not acknowledge him. He is now Mr. Nobody to you and you should show that with your actions.
Spurn his advances to be friends
By this time his anger will have subsided and he will want to reconnect with you albeit as a friend. Ignore him for some time before you accept his hand of friendship. You have to time this step to perfection for it to be effective.
Reveal your changed persona to him
He has to realize that you are not the same person he rejected sometime back. For that to happen you will have to get rid of all the negative traits you might have. Once he sees the new and improved you he will want you back as his girlfriend.
Do not commit as yet
Once he accepts you as friend he will want to take the relationship to the new level. If he does not show any inclination to do that then don’t get restless. It only means you still have work to do.
Set the terms yourself
Once you have completely changed into an ideal person that he fancies he will approach you for a romantic relationship. Now is your chance to set the terms for the new relationship. Tell him the changes you want in him and only when he does that should you consider his proposal.