I think if you work as hard at your own recovery as you want him to work at his, these questions will be moot.
Life is to be lived in the present moment. So, if things are good, enjoy it. The present can easily be messed up simply by trying to project what it means into the future. That's why they say "one day at a time."
I agree, though, that if you are living separately, no big rush to change that. It's important that you feel comfortable before getting back into the relationship fully. It might surprise you to know that you will find that comfort in YOU, not him. When you trust YOURSELF then it won't matter what he does or doesn't do and you won't live in fear of him relapsing.
L