loloita, he probably thinks he can control it. Right now he's sure he can, but this scenario is not the right one for proving he can stay sober. I'm sorry about his attitude because he's acting like he's entitled to your trust and forgiveness just because he tells you so. I wonder if he's sober right now or if that's been put on hold until you come home? So far he seems to have made no effort beyond promises - no treatment, no moving out and proving he can stay sober. As a recovered A, I know that promises are empty and there has to be a complete change of mindset.
At least now you know where you stand, and you can make plans accordingly. Legal advice, jumping on the finances right away (joint accounts, credit cards, need to be under your control), maybe help for the children through the school.
All the best - work with what you have, and plod forward, even if it's hard.