My husband of 22 years is a 'functioning' alcoholic but I use the term lightly.
Yes, he works (hard), cleans the house and cooks.
But he can not function as a healthy husband, lover, father and these are the things that should matter in life. He verbally abuses his wife and 19yr old daughter, keeps himself disconnected from his family choosing to drink alone, listening to music. His sex life is absent because he drinks and verbally abuses his wife and daughter, he is bored with his life because he is numb to life.
There are very few happy endings with alcoholics, sorry to say, especially those in deep denial.
As you read more, attend Al-anon and learn about the disease, you will discover that you need to start putting yourself first and learn to detach, whether you stay with him or choose to part, or it will suck you in and cause you years of misery.