Accio, I'm so sorry for your heartbreak! But jw's aren't supposed to date/marry non-jw's. He knew this when he started a relationship with you.
Please consider seeking professional help. Does the school you attend have counseling services that you can use? If not, can they recommend one that is affordable to you? Perhaps the other problems in your life, combined with the fact that he was there during them, are making the loss of him seem more difficult. But you need professional help now. You are becoming physically ill from this man's exit from your life, and it seems he is stringing you along, just in case, or perhaps because he is confused as well. No matter, YOU SHOULD NOT GIVE ANYONE THAT KIND OF POWER OVER YOU. YOU NEED TO TAKE YOUR LIFE BACK AND MOVE FORWARD, LIVING THE BEST LIFE YOU POSSIBLY CAN! Don't you think you deserve it, with someone who won't play games, intentionally or not? Again, please seek professional counseling, and try to focus your energies/attention on your schooling. All the best to you, Accio. and we are all here for you as well, if you need a shoulder to cry on.