RE: Have you ever lusted so bad...
the pain won't go away. Its hard to let go of it, so try and keep your mind busy so you won't think about him. Everyone goes threw these stages when they lust or just infatuated by someone they believe is the one they want. Truly, your just putting this person inside your fantasy and making them act the way you want them to accordingly in your mind. In reality, it isn't the same, they have a mind of their own and you can't force this love of yours on someone that just doesn't feel the same way.
Just keep busy, or spend more time with the person until they feel the same way, if not keep busy till your over the person and then find another person to repeat the process.