If you want to make your ex boyfriend miserable without you, you need to give him a taste of his own medicine. You need to remember that you are not doing this to take revenge. You are just showing him how much hurt he has caused you by making him feel at least a small amount of the pain you are feeling right now. You need to do this in love and not in hatred. The main goal is to get him back and make him love you with all his heart.
The first step towards making him feel at least a portion of your hurt and pain is to dump him. But how do you dump him when he has already dumped you? Well, he is under the perception that he has dumped you but you are still after him. This is what most guys feel after they have dumped their girlfriend. They also assume that if they turn around and ask their girlfriend to come back, they would literally run and fall into their arms. Well, you need to give him a surprise. You need to show him that his assumptions are wrong.
So write him a short note saying that you agree to the breakup! This might sound counter-intuitive to all that you have heard before. But as I said earlier, you have to give him a taste of this own medicine. He broke the relationship because he felt that it should end. Now you too say that the relationship should end. So write to him saying that you thought about it for a while and you are convinced that a breakup is the right thing for both of you.
This would come as a big jolt to him. Now he can no longer assume that you are after him anymore. He knows that you are out of his reach. Even if he wants you back, there is the possibility that he may not get you. Now that is powerful! A guy will start to feel very uncomfortable when he is no longer in control of a relationship. He can no longer call you and make you dance to his tunes. You are no longer ‘his girl’. Now that is going to give him sleepless nights. You have got him now! He’s hooked. As long as you keep running behind him, he has control over the relationship. But once you agree to the break up, his knees will start to shake.