All of the advice above is exactly right, but don't forget that you HAVE TO get some closure on the relationship. Maybe it's too soon right now, but you absolutely need to tie up the loose ends if you're going to be able to heal and move on. You can talk to him in person, call him on the phone, write a letter, or send an email, but at some point, you're going to have to let him know what he's done to you and how it made you feel.
Think of the pain as an infection in your emotions. With time, the wound does heal over and stops hurting, but the only way to truly be healthy is to purge the infection from your system. Finding some way to communicate your feelings to him, even if he can't/doesn't respond, is the only way to do this. Take your time, be honest, try to keep it as unemotional as possible; but let him know what this has done to you. It's awkward, uncomfortable, and no likes to do it, but it really is the best medicine for a broken heart.