CJ - It sounds like you have put a lot into this marriage. It also sounds like when he asked for a second chance your lifelong character flaw of putting others before yourself popped out and you feel like you have to do something you don't want to do because its what your husband wants.
There is nothing wrong with doing what's best for you, because in the end that is what is best for him. People stay in situations they aren't happy with for this reason - how can one unhappy person make a happy couple? Not possible.
You can put a divorce on hold indefinitely I suppose. I have friends that just need to sign the final documentation and its bee sitting on a desk for a couple of months because they aren't sure. There may be reasons why you should legally separate or your State may have certain rules to follow. Best to ask your attorney as you planned.
Good luck to you - it sounds like you have this handled but just need reassurance. Its ok to want what someone else doesn't, it really is.