A Discovery in our old Van

The credit reports were all squeaky clean, except for this one particular credit card.....one that he SUPPOSEDLY opened up while we were together. I again questioned him about it and he told me that he did NOT open up that card. So, where did it come from? I was puzzled. I wanted to believe him but it was hard. Anyways, as far as getting that van, he did. He had to come home early that day and clean out the old one, as he was trading it in. Things went well with the transactions. We drove away from there with the newer one. It sure was pretty. However, the next day, while I was at work, he called me. Wow, he doesn't call often, unless he wants me to do something for him, so I surely knew something was up. Sure enough, it was. He told me that I had to call the dealership up and tell them that he forgot something out of the old van. So, we went up there--an hour drive one way, to get this "something" out of the old van. I was wondering what could it be? Well, he would not tell me what it was, until we got there. Much to my suprize, he started taking the front piece of the floor off, in the middle of the seats, and he pulled out a $100. bill. Oh my goodness. I was wondering what was going on here. Had he been hiding money from me? Money that we needed to pay bills, to buy groceries and to keep the household running? I was very upset. I questioned him and he told me that he just forgot that he left it there. I was very hurt, and of course, he wasn't talking.