He is your ex boyfriend for a reason and making him jealous is really a waste of time. Chances are he has already moved on and had someone waiting for him when he broke up with you. Men are like buses there will be another one along in a minute and the best part is it will be a nice shiny new one. Break-ups are hard emotionally but the best revenge is living a good life and doing what is best for you. If he ended it then he doesn’t know what he is missing out on and there is someone out there who will appreciate you.