Well that's good, that'll help physically and that's a start.
You're right we can't stop losing people. But if he shuts the world out completely he'll wind up cold. Not caring. And that's not him. That's so far from him.
I'd like it if he'd talk to her but I get why he might not. You know though that if he gets worse, stops eating, reverts. We might have to take matters in hand, for his own benefit.
A trip with you and Clark could be amazing for him. Time away, clear his head, free of all....this. It could really help