I'm not going to be supportive of my girlfriend through medical issues
Are you kidding? Why wouldn't you be supportive?
I want to make fun of her that nobody will care about her if she's dead.
That doesn't sound very nice! You need to be more supportive of your sick girlfriend. Most people would say that she deserves a lot better than what you're giving her.
No way, I don't care about her!
You need to break up with her now if this is how you feel, because it sounds pretty twisted to say that you don't even care about your own girlfriend. Let her find someone who will take care of her if this is your attitude.