I'm not going to defend my fiance.
Why won't you defend them?
He refuses to get healthcare.
I can see why that could be frustrating. However partners are expected to be there for them through the difficult times.
What if they don't listen and are stubborn?
If he's stubborn and doesn't listen you may want to find someone who can get through to him. Whether it be a friend or family member of his. Someone who can act as a mediator and explain your point of view in a way he can understand.