The words most women dread to hear is 'I need space'. If you suspect your boyfriend is getting ready to say them, you should be prepared. If you are caught off guard, you will probably cry and beg him to change his mind. That will just make him feel that he made the right decision. Your ex boyfriend will also feel that he can have you back whenever he wants to. You can turn things around to your favor if you are ready for him. When he says he needs some space, put a smile on your face and say 'I agree'. You can also add that you have been considering the same thing for some time. Now he is the one that is stunned.
Be sure to get him out the door before you break down and start crying. After he is gone, go into your bedroom and let it all out. Kick and scream as long as you want to. Then go get a good soaking bath and get yourself together. Be happy in the thought that you have won the first battle to getting your ex boyfriend back. He is somewhere right now wondering why he is the one that is feeling upset and rejected. Now you have to keep up the good work.
Completely ignore your ex boyfriend and have no contact at all. You have him bewildered and feeling as if you dumped him, so do not let up. Keep yourself busy with your family and friends. When your ex boyfriend asked for space, he was expecting you to chase him relentlessly and beg him to take you back. But when you act as if he does not exist and move on with your life, he will have second thoughts about needing space. You are giving him more space than he can handle and he will feel that he has made a big mistake.
Your ex boyfriend will be wondering what you are doing, so let him see how well you are handling things. Get dressed sexy and desirable and go out with your friends. Make sure you run into your ex and let him get a good look the woman he let go. He will start eating his heart out with desire for you. Seeing how well you are living life without him will make him see how miserable he is without you. Your ex boyfriend will make a vow then and there to get you back.
His first attempt to contact you will be by email to test the water and see how soon you will answer him. If you answer him, you will undo all of the work you have done to get him back. Ignore his email and make him call. When he does call, let him leave a message and wait a few days to call him back. When you call him back, explain that you have been very busy and you only have a few minutes now. He will try to talk you into meeting him for coffee or lunch to have a talk. Agree, but tell him you will have to call him back to arrange a time and place. This keeps you in control and him coming to you. Always keep that control and he will never need space again.