When it comes to drugs, the addict often ends up not caring what they look like to others as long as they can use. Even if you think outside appearances are so important to your AH, there WILL come a point where even that will disappear.
In my situation, my AH often gets so messed up he still THINKS he is making sense and presenting a good front, but that is the disease talking. He is SUCH a mess that it is OBVIOUS there is something wrong.
Once, the time he OD'd at his parents house, I found him nodded out sitting straight up on the floor. And when I confronted him he slurred, "Why are you doing this to me and my family?? How dare you make my Mom worry there is something wrong, there is NOTHING WRONG I AM PERFECTLY SOBER!!!" He doesn't remember saying that today, but he did. Two hours later he was being rushed to the hospital in an ambulance. But he truly believed at the time that he was for all intents and purposes "keeping up the image" of a sober person. It was very very sad.