Sorry, you seem like a strong and loving and amazing partner.. he is lucky to have you. But he is most Definitely not reformed in any way. Yes drug addicts lie.. convincingly too as you know. I personally think you should walk away.. It seems you are waiting for.. something.. maybe another confession so you can be sure?
This pattern could go on forever and ever. Nothings ever going to change if everyone keeps doing the exact same thing he uses, he lies, he confesses, you get mad, he says he wants to die and you freak out and take him back in.. that's no way for either of you to live. I feel for you so much. I hope you can speak.to someone, maybe one of his regular counsellors/doctors? and get some clarity on all this.
Sent from my HTC Desire S using BubHub