My husband wanting to die


My husdand is an alcoholic he's been through a lot as a child and with his dad passing away Feb, I don't blame him for being in a funk or angry. But today he said he don't want to do this anymore, when I asked what he tells me "I don't want to be here" I replied "in this relationship? Or in this house" we stay with his brother he tells me "in this world" my heart dropped to my stomach I couldn't help but cry in the shower. I didn't know what to say to something like this we have 3 beautiful kids, he's strong, funny, hardworking, and very loving (when he's not drinking). I couldn't think of anything to say so I just held him til he fell asleep. I've never had to deal with anything like this. What do I do? What do I say to him?