[Crowley gives Aziraphale a rather desperate look. He's defeated, really, Aziraphale won't seem to accept the help, no matter how much he needs it. Even still, there's something else tugging at the demon's heartstrings in a very uncomfortable way. He's been about to Denny and spoken to other locals, Crowley's been made well-aware of what this disease does, and how to cure it. It's exasperated by hiding things, lying, not being open or honest. And if Aziraphale has proceeded this far along, it means he's hiding something. He's hiding something from Crowley. Hell, he can't even admit that he's not okay. That hurts the demon almost as bad as seeing the angel like this.
He sighs, taking a seat beside Aziraphale and trying to even his temper. He's creeping to an almost angry level, and despite trying to mask it, still speaks through his teeth.]

You won't be alright. Can't you see that, angel? You're killing yourself because you can't just admit that you're not alright.