This man has a serious problem, a disease that has no cure. There is nothing you can do to help him, it is all up to him. This disease has tenacles that reach far and wide and have a negative effect on everyone they touch, you, his family, your family and friends.
Take some time to read the stickeys at the top of this page and cynical one's blogs, knowledge is power and you need to fully understand the impact that marrying an addict will have on your entire life.
Read around and keep posting, it will help.