Right I've been friends with this boy since secondary school and we've left now to go to college and I spoke to him on msn saying I'm scared because I might have diabetes :S and then he was saying there's nothing to be scared about. Then I said I don't know if I will die from it but it's a possibility and then he said "yeah well dnt tell me the possiblilty u just want me to feel sorry, i dnt like that" and then I wrote something back to him and he hasent replied since :/ whys he acting like this, it feels like he won't care if I died or not :/

Maybe he has fears or other things he is dealing with. Maybe he had a bad day.
Call him and see how he is doing instead of worrying that he does not care.
Have you been to the doctor?
Do you always come to him with this sort of thing?

He did sound a bit annoyed when I started talking to him on msn :S and yes I always come to him with this sort of thing and he is not help at all, its like he don't care

Well perhaps he feels like he is being used. Have you been to the doctor do you always worry about illnesses you don't have?
Do you ever chat with him to see how he's doing?