Marriage licenses do expire without a ceremony. They had a ceremony, and they are married. Getting a divorce is not a little thing for anyone with assets. Perhaps they have a prenup. Perhaps she did not feel married because the prenup said she gets what she came in with. Or maybe husband was mentioning divorce before this. It just seems so strange that anyone would deny a marriage. When people get married at the JofP they say they got married at the JofP.
And she told Leah she was single so she could get Leah's help in selling her a couple of paintings? I would not blame Leah for not trusting her.