You don't you broke up for a reason and if you get together with him again you'll just realise it all over again and possibly be tied into an awful or abusive relationship you don't want to be in.
make him jealous
You don't.
ignore him and let be seen with a cuter guy.
dont just dump him
Win the lottery, or have a miraculous experience. Please do not hold your breath .
i mean, if he's your ex-boyfriend he's your EX-boyfriend. that means...boyfriend.
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Be sexy, try to be hard to get but constantly around him at the same time
Thats impossible
You don't. He's a loser and so is she.
There are many ways and techinques to get back with a former ex. It just depends how much and willing you are to learn these methods. Check out my site about break-up information and how to win your ex back http://www.squidoo.com/WinningBackEx
get another boyfriend and make ur ex boyfriend jelous