[shakes his head a bit] It isn't that I worry you'll treat him differently.
Even before... Most of the people who know at home are his friends and care for him deeply. I doubt they would let something like that affect their feelings for him.
The fact that they were only told about it as an administrative move to ensure that should he change, they knew it was their duty to eliminate him... That's what hurts him. The lack of choice in revealing what is, to him, a personal and painful matter...