a suspicious mind?

Another elevator conversation story - I was riding up to my apartment one evening last week with a friend who was going to visit for a while. Two other people, a young man and woman, got on the elevator in the lobby at the same time.  The young man was carrying some bulky packages and apologized for the space they were taking  then went on to explain that his girlfriend (the young lady with him) did home nursing, he was carrying some of her equipment and he liked to go with her when she was going into some iffy neighborhoods. I told him he was a good man and thought no more about it. We wished them a good evening and got off on my floor.  A little later when my friend and I were in my apartment she said to me "Do you think he was telling the truth, about her being a nurse and all?" I was surprised that she even questioned it. Why would anyone make up a story on a 30 second elevator ride?  Maybe I'm too trusting but I shall continue to take my fellow elevator riders at face value. Besides, how would I ever know if they were lying?