It seems to me that until he figures out what he wants and gets help, you should leave him be for the time being. Because it seems like the more you get with him, the more he's dragging you down and sort of using you (although it isn't intentional due to his depression) all the more reason for him to get help. He can't keep pulling everyone down, especially his loved ones, and if you really love him, I think you should help him find someone who can actually help him in this condition, before it's too late. Good luck!