You might feel as if a ton of bricks had fallen on you. You are overcome by a feeling of great loneliness. Even with plenty of people around you, it will feel as if you were the last person on earth.
No doubt, these are the aftershocks of a breakup or a betrayal. You'll have to pull yourself out of this, regain your balance and rethink what you are going to do next. Only you can really understand your feelings, and therefore only you can actually discern the correct way to proceed.
What choice do you have other than to pick up the pieces and try again? Once you have a chance to look back and reflect on the details, you'll probably realize that you're better off trying a new approach or a new beginning by moving on. Through enlightenment comes empowerment.