I often have the same thought and I don't think I believe much of what the addict says unless he shows complete honesty which Indont think is the case. I won't be surprised if it turns out that he is using the recovery community to manage his use and maintain relatively healthy and functioning to hide the truth.
Obviously it's a torture to try to figure out what's real and what's not. The trust is not there. The best sane way to handle it I think is just to focus on yourself. Whatever you can do to make your life better. If you choose to be with the addict, then just accept who he is. That means he might still lie and be an addict for the rest of his life. If he cannot recover at all can you beat all the consequences of living with an addict? If you can then I think you can stay. Otherwise, maybe you should really detach with love and focus on your own wellbeing.