Cancers , how do you handle failure or when there’s a setback

My cancer is going through something and I’m trying to be there in the best way possible . It feels like he was putting on a front to be positive about the situation but I kinda felt that he was trying really hard to be positive even though deep down he was disappointed and sad.

But the vibe I’m getting is he might just need to be left alone . He hasn’t respond to anything right now . I told him it’ll be okay, an injury is something you can’t control. You’ll just need to work to get better .

But if he’s anything like me ... saying positive things and coddling him almost makes it worst . I’ll say it once to let him know I’m here and then leave it alone

So I was just wondering . How do cancer deal with stress, disappointment, failure or a major setback

Well I just fall into a deep depression unless I see a avenue to pul me out of it. Most of the time there isn't.