Alanon can help you. You ARE addicted to him, just as he is addicted to alcohol. You cannot help him. He does not want to change. If he ends up killing himself with alcohol or drugs, then that's his choice. You can't do anything about it. How many times have you "stepped back" because of his actions and his treatment of you?
This man is not your best friend. You knew him all of six months before he showed his true colors. The man you fell in love with does not exist. What you are seeing now is what he is.
You have a daughter and she deserves better. You deserve to be with someone who treats you and your daughter with kindness all the time, not just when he's not drinking. He has absolutely nothing to offer you or your daughter except misery. Break away from him for good and attend alanon meetings to learn how to put yourself and your daughter first in your life.