I haven't brought it up separately and I'm not sure I will. We get along really well most of the time and I don't want to go searching for a fight. Its just a TV show at the end of the day.
How on earth do you define having what in most marriages would be a normal conversation as "searching for a fight"?
You're not upset about the TV show. You LIKE the TV show. You also have personal, moral beliefs about the behavior it portrays. The issue you're talking about here is your morals versus your WH's morals regarding fidelity and gender. The TV show is just the allegory you two used to launch the conversation. The moral differences between you and your WH are the reason you're upset - and I'd argue that "moral differences" are one of the biggest, if not THE biggest, issues a marriage can have.
In other words, you're mad because you know that your WH still doesn't think his affairs were wrong. He's glad he had them, and he'll probably have more because he wants to and because he's a man and believes he has every right to. And he likes how submissive his affairs have made you. He likes sitting next to you, his pregnant wife, and telling you how much he admires someone who fucks other women and kills people, and he enjoys seeing you keep your mouth shut in fear of his response, because it gives him power over you. That's why you're mad. Because he's put you in the position of not even being able to tell him how you feel, for fear he'll stop pretending to be nice.
In any case, you've agreed to stay with him until the baby is born, and you've drawn a few lines in the sand, most of which he's crossed and you've backed off of. The unspoken agreement at this point seems to be - you keep your mouth shut, and he'll play the part of a good husband, except he's still himself so he'll still let you know who's in control in small ways, all the time. Like during this TV show, and I'm guessing in many more 'small' ways.
I'm just wondering if you and your IC have come up with ways you'll be able to cope with this for the duration, especially if your hormones start peaking. It's stressful enough having to walk on eggshells and avoid what would usually be considered normal conversation, because you don't want him to get mad, without also having to control your natural urge to protect yourself and your children.