The only thing I can say, which probably won't provide you with much comfort, is that you need more time. Things might seem different one day, but with how strong your feelings are, that won't be for some time yet. It's going to hurt a lot but don't wallow in it. I'm a great believer in learning from trying times in your life and coming out the other side a stronger person.
You're keeping yourself occupied, which is good, so continue to do that. I don't think it's the best idea to date other people when your thoughts are so firmly on your ex. Some people might say dating someone else will help you forget, but I don't think that's true.