Hi ~ So sorry. You think a broken heart will kill you but it doesn't. You keep living. I am a woman, I have had a broken heart. More than once sad to say.
My advice is take a break. Don't contact him. Find a friend, relative, someone who will agree to talk when you weaken & reach out to him. And then do your best not to contact him. I Know! So hard to do, but you need to heal. Take care of you right now. The old adage that you need someone to complete you is wrong! You need to be whole in yourself, then when the time is right, someone will see the whole, beautiful you & that my dear is a much more attractive package to any man. Be strong. Check out this book, How To Break An Addiction To A Person. It helped me a lot.