He'll try to make you jealous
Make her jealous, Or talk to her.
He might be trying to make you jealous, but he may also just want his ex- girlfriend back. In this case, usually your ex- boyfriend can try to make you jealous which can mean he wants you back and by making you jealous you will come back to him, or it can also mean he is trying to show you how much you need him, but you can't have him. The real answer is, no body can know other the the ex- boyfriend himself.
It is to make his ex jealous
Why would you try and make her jealous? She is in a new relationship trying to make the best of it.
they make sure that they see you with their new partner and try and look happy :)
Make him jealous:)
he will try and flirt with you and might also make you jealous by flirting with other girls when your around.
i don't think there is a way to make your ex jealous. only if she wasn't over you then yeah you can make her.
For my opinion to make your ex jealous maybe you can act all happy and confident and also smile, laughing all the time... DO NOT show him your sadness. Even if it u dumped him or him dumped u DO NOT show any sign of sadness and loneliness because it will make him think that you still love him and that he might even try to make you jealous! And also when he is bored and ask u if you're free, try NOT to be available this will make him jealous tooo....
You could try not being and inmature D-bag and just move on.
Say that you are sorry for what you did but if they don't come back, then follow him around with someone else and try to make him jealous.