Is it a good idea to try to make your ex jealous? Could it help you to get him back?

Not necessarily: jealousy is a two-edged sword. It could prove to be the magic trick that will help you to get your ex back. But It might just drive him further away, or even destroy your relationship. So you should proceed with caution.

Jealousy can be a powerful weapon. But it is also a dangerous one. Think carefully before you open up what could be a whole can of worms.