You have to ask yourself why you are truly heartbroken and he isn't. Have you looked at your relationship from his perspective? Have you walked just an inch in his shoes?
Take some time to back away and get a good grip on how you really are. This might mean that you'll have to grow up fast but I believe that you can see things better when you both have space and time. Involve yourself in the activities that mean something to you and that are extremely productive (i.e. photography, volunteering in the community, baking cookies and giving them to the neighbors). Being active will help you back away from some of the "heartbreak" you're feeling now. It will take time but you'll stop playing mind games with your heart over this young man.