I think you and I agree that there is no other explanation that accounts for their behavior. As Arthur Conan Doyle said as Sherlock Holmes, "When you have eliminated all other possibilities what remains must be true."
There were people that reported an argument between Bill and Hillary back when he was running for Congress... a race he lost by the way... Hilllary told Bill it was time for him to quit playing with his girl friends and get down to the business of getting elected. Note she was not angry that he had girl friends... She was angry that it took too much time from his efforts to get elected.