Is it safe to ride on the back of a motorcycle with one whose sugar reads 400-500.He doesn't take his insulin.?

Your boyfriend will die before 40. He needs to take care of himself to prolong his life. That fruity smell is probably Ketoacidosis which is dangerous. I am a diabetic and when my blood sugar gets over 400 I feel like garbage. His feet probably feel like they are on fire or numb. His kidneys are probably in horrible condition. He is not in a right frame of mind to drive if his blood sugars are that high, especially on a regual basis. Check the link, It will help you be more educated and maybe you can help him.