Congratulations on telling your fiancee! That is such a huge hurdle you got over. I am sure it was very hard to tell him, but imagine how much less effort it will be to not have to hide the truth from him for the rest of your life. You have so much to deal with over the next while, and now you can focus totally on your sobriety rather than split your focus on getting well and hiding things from him.
Stay strong! You are doing great!