I really need advice

My boyfriend and I just had a serious conversation about his mental health. He’s been feeling emotionally numb and he said the only thing he knows is that he loves me.

I’m worried about what I should do to help him. I have depression myself but I’ve never felt like that so I don’t know what to do.

He’s working night shift at his job so his sleeping schedule has been bad. And we haven’t been doing a lot because he’s been so tired. I don’t want to blame how he’s feeling on him being tired and make him feel like his feelings aren’t legitimate. But I feel like him being tired might be part of the problem.