My first real break up. What do I do?

I dated this girl for three years until last Sunday. I honestly don't know what yo do. I am broken hearted and it hurts so bad!!! I have all of our memory's running through my head. All the promises she gave me a week before we broke up. I don't want to see her with another guy, like that terrifys me in every way. She broke up with me out of no where because she says she doesn't know what she wants. She says she is feeling the same way I am feeling. Their is no way! I have a strong feeling of wanting her back, I'm crying myself to sleep. I don't eat much now. What do I do people?
My first real break up. What do I do?
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