After a breakup, you should realize that there needs to be a cooling off period. You will be too emotional and your ex boyfriend will be too angry for communication. That might lead you to ask, how long should you wait before contacting him. The answer to that is, you shouldn't contact your ex. The key to getting him back is making him contact you.
You should not be thinking of contacting your ex anyhow. By breaking up with you, he made it apparent that he wanted to be alone. You have to respect his wishes and accept the breakup. It will not be easy, but the sooner you make a life of your own the sooner you will get your ex boyfriend back. It might seem strange, but the longer he is without you, the more your ex will want you.
Absence really does make the heart grow fonder, when it comes to men and falling in love. Where you as a woman, will fall in love from being close. Men fall in love from a distance. That is why it is so important that you give him the time and space to miss you. This will require you to have patience, but you cannot let your ex think you are sitting at home waiting for him to call.
To make your ex boyfriend contact you, it will be necessary to make him think he might be losing you. So although you should not have any contact with him, he needs to know what you are doing. You can do that through mutual friends. Always be cheerful and upbeat when you are around them. Always look your best and do not mention the breakup. If they ask you if you are dating anyone, be vague and let them think you might be.
They will be quick to get the word back to your ex. This will show him you are not sitting around waiting for him. When they tell him you might be dating someone, it will make him realize how much he still loves you. He will not be able to stand the thought of you in the arms of another man. He will begin to regret the breakup and wish you were back in his arms.
Thinking he might have lost you will make him want you again. As long as he thought you were his, he didn't realize how much you meant to him. He took you for granted. Now that you seem unattainable again, he can think of nothing but getting you back. Your ex boyfriend will hold out as long as he can. But in the end he will have to find out where he stands with you. This puts you in control because he is coming to you. That is why the key to getting him back is making him contact you.