I feel multiple things happened. First, he wasn't honest on here about how it started, but clarified it, causing many to question him. That constant questioning I feel got to him.I fear it didn’t end well either. David seemed to have lost control of the situation judging by the way his messaging dropped off. Lots of details in the beginning but less and less as time went by. He didn’t want Shelly to know he was posting. Also seems like Shelly did not seem to share with him the more she got into it. And Marcus was not a professional bull. Who knows what he really wanted. It’s not a lifestyle you should go into unprepared. maybe he’s so happy he didn’t need to post anymore but that is the less likely option.
I agree, that he most likely let a fantasy get away from him.and I feel is likely that Shelly is in the process if she hasn't already of leaving him.
I thought it was incredibly foolish to give up every weekend with his wife to another man. Who his wife was in love with. Where I in his shoes I would not have let that happen. Also, birth control is not 100%. He kept saying that allowing Marcus to get Shelly pregnant wasn't going to happen. In my book I feel it is only a matter of time. Even with birth control. Then its game over for him I feel.
I could be wrong. Wish David would speak up to correct me.