You are doing the right things. Its hard being the partner, it is truly like being on an emotional rollercoaster. You begin to normalise things that aren’t normal, you become desensitised to situations to get through them.
Things to look out for are, lack of appetite, dilated pupils (depending which side they snort one eye will be more dilated than the other), different tone of voice, spending more and more time away from the house/working longer hours to stay away from where they know they can’t get away with doing it, inability to get up in the morning. There are so many differences between a clean person and someone who is using, you’ll notice if you tune in.
Keep smiling 🙂