As I once drunkenly advised a friend "there's plenty of more fish in the toilet".
It happens man. There will be those one's that just get you right at the core and you might feel like life will never be worth living. You just have to solider on. Just focus on yourself for the time. Do something you've always wanted to do, start exercising, keep your mind going. The pain will start to fade, and you'll start thinking "Maybe, she wasn't that great after all."
Then one morning you wake up and you realize you've moved on, and you'll be much better for it.