You really are doing great! My H used to hide the bills from me too...part of it was so I wouldn't see he was using them to pay for his adult friend finder acct, part of it was his own trust issues (he only used one cc to pay for AFF). Now, he doesn't hide the bills away, he leaves them out where I can look through them if I choose to.
Not too long ago we had to deal with one of our credit card companies (who were seriously ripping us off) and...I had to go back and pull bills for our attorney. I forgot he had used THAT card for AFF, and of course that was one of the bills I had to pull...when I saw it he asked me what was wrong, when I told him...he didn't flinch, didn't make an effort to hide anything...didn't even get that "oh [censored]" look on his face. He just took the opportunity to reassure me...that would never happen again, which is exactly what I needed. It's taken several months, but he seems comfortable sharing the bills with me now...instead of just telling me they're paid.