If he doesn't truly believe he is an A, I don't think he would even consider going to an AA meeting. My husband readily admits he's an alcoholic and thinks that AA is the biggest joke on the planet. He thinks he can quit anytime he wants by gradually weening himself off.
Maybe the last three days of his drinking without you nagging him about it made him think a little. Maybe he is just going or lying about going to appease you. Has he ever made mention of AA before? I do understand how your trust in him has faded away so it is natural for you to doubt his sincerity. I guess you'll know when he gets home. Please post again and let us know what happened when he came home.