David was and probably still is, incredibly unhappy in his marriage. Not only did he bring his mistress to dinner with his mother and sister, but he gave his wedding ring to his daughter to give back to Shannon. He was done with his marriage. And he was happy - maybe for the first time in 10 years.
Shannon is not only a nutcase - as easily seen by all of her crazy antics and hospital air in her home, but she drinks a lot. She's also vindictive. I remember on a season past when Vicki passed up an invitation to go to dinner with other castmates and instead had dinner with Shannon - who at the time was the outcast of the show. Vicki was there for Shannon when Shannon needed her. But now Shannon won't forgive or at least move on with Vicki.
She didn't sleep with David - for how many years we don't know - but when she first came on the show, she was sleeping separately because she stayed up late and David got up at 4:00 am.
Plus, she doesn't work or in anyway contribute to the family fiances, but she likes to live large. The company that David owns is actually jointly owned with his father. I read this online. So perhaps David has a better relationship with his father and his father's new family? I don't know but I do know that he obviously also loves his mother and sister. Shannon must have thrown poison into that particular family's dynamics early on, or David wouldn't have felt comfortable bringing his mistress home to them.
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