You MADE him say it? Did i miss the part where you held a gun to his head and forced him to say he wishes you were dead? You didn't make him say anything, he made a conscience choice to say things to hurt you and then refuses to take responsibility for that! He might not have meant he wanted you dead, but he certainly wanted to hurt you as much as possible.
Everyone argues, but not everyone looses it. Arguments don't make your brain suddenly disappear. People say things for a reason. And his reason is to make you feel shite about yourself and to hurt you.
Time to make this on off relationship a definite off. Time to give yourself a chance to find a man you sees an argument as an exchange of opposing viewpoints, not as a change to hurt and belittle the person he is supposed to care for.