What Melissa said. He knew it was a risk. If I were him, I would interpret any other action on your part as meddling. Your other doctor's suggestion of giving him a card is way out of line, IMHO. If he's avoiding the meeting because of you, I'm sure the last thing he wants is for you to seek him out and talk to him about it.
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I don't want him to feel that he cannot attend the meeting because one of his patients attends.
You may not want him to feel that way, but if he does, there's nothing you can do about it. Addiction is embarrassing. Just because you know someone else is struggling with it, that doesn't mean that you have to feel comfortable talking about it in front of her. Lots of people avoid meetings for that reason. It's their prerogative.