I could recommend you to go somewhere alone. The best would be a beautifull place, of wich you are shure that you will stay undisturbed. Eventually bring some Alcohol with you. But not knock yourself out with it, just enough to enhance feelings. Like 1 Beer or something like that. Sit down and think all aspects of the relationship through. Take your time and just think. Do nothing else. After a while you schould rationalise the whole topic and then think of positive parts of your live. What you still have and will soon get. Think of your friends, your family, your dreams that you still want to accomplish, etc. When you have cleared your head go back home and fell better. I hope this will help you. I wish you good luck.