If Nathan truly loved Adrian, then he would not call him an idiot.
Elliot never called Shea such a thing, and he would get furious if anyone called Shea an idiot.
This was the difference between loving someone and not loving someone.
"There's an old saying in Aryadelle that you never see a good person standing by the bed of someone with an old illness. I think Adrian's family probably does love him. Otherwise, they wouldn't have spent all that money and effort to treat his illness." Avery too