I thought the partner of the young girl just seemed nervous and overwhelmed and dealing with it differently than the girl did. She babbled with nerves, he just shut down. Both normal responses to the huge thing that happened to them.
And yes, fair enough, maybe Steve and his wife have that sort of relationship, but I would not want to have that relationship myself! He did look like he really didn't want that baby when they she was talking about the conception. Maybe he was just nervous in front of the cameras?
I still didn't like him.