He likely was protecting his bottle or wanting to keep the peace. Had he come home with one bottle and you had fallen off the wagon, then you might have freaked like you said you would have done in the past.
He figures if he brings home two, then he's safe - he doesn't have to give you his bottle and/or he doesn't have to get yelled at. His fault was in not understanding that if you were still on the wagon, then it will probably be a temptation. He likely figures if you're done, you're done, so no harm in bringing home the second bottle. Tell him this is not the case.