Married At First Sight season 18s David has some red flags for his new wife Michelle that the experts decided to ignore, which proves that they need to be replaced for their lack of care. Throughout the last several seasons of MAFS, there has been little success in creating lasting relationships. With only two couples still together after Decision Day in the last 6 seasons of the series, Married At First Sight season 18 was under a lot of pressure to make successful matches. David and Michelle, whose wedding was shown in a recent episode, were hoping to be one.