Welcome lishi. I'm so very glad you found us and also sorry for what brings you here. Anyone of us can testify that you are doing the right thing and also that the pain involved in doing the right thing is horrible.
Yep alcoholism and depression definitely have a connection. Maybe it was depression first and then alcoholism; maybe it was alcoholism that brought on the depression. The horrible painful reality is that this may take his life and the horrible painful truth is that this is his choice to make of his own free will. Ugh.
Please please take care of yourself in every way you can. Many can not do what you are doing as it is just too hard.
Let us know how you get on.