Hey there,
your story really resonates. When they are sober, you know in your heart that they wouldn’t ever cheat. The love was/is pure. But you don’t deserve to be cheated on full stop. I know it’s his illness, but you don’t deserve to sit there wondering when/if it might happen again. I don’t have much advice, but also keen to see other peoples responses to you, I guess for a bit of hope for you and I. I went back several times to a cheating addict, and it happened again and again. I know it’s the drugs really, but that doesn’t mean he could stop himself doing it in the future. I think you are doing great with the no contact, I bet it’s killing him as much as you. Take some time to heal with the hurt he has caused, give him his space to show he’s actively recovering, then see where you are in a few months. We are only on this planet for a short time though, please don’t go back if there’s even a slight feeling that he might do it again.
wishing you both health and happiness, hope you both get the outcome you desire x