Husband is unhappy about life in general

Husband tells me he’s unhappy in life. When I ask him what he would want different or change, he says it didn’t matter because he’s always like this and always will be this way. I’m trying to approach it with curiosity and tell myself that it’s what his brain is producing for him at this time. Anything else useful and intentional that I could be thinking at this time? I don’t like the idea that he is so unhappy right now.