When talking about the original release, you are 100% correct. The devs want the player to feel distrust when in reality, the couple trusts each other entirely. Many people have complained that the MC will not fight back against Steph being bitchy or assert himself, especially when on the low-confidence path. The current release has removed most of the information that made the player distrust Steph. The devs have even made Steph more loveable and Gina less likable for the purposes of taking the argument away from the people complaining about Steph and choosing Gina. The latest version has been written to ensure that the player understands that they are working together, they are in love, and will not leave each other no matter what sexual choices the player makes, high- or low-confidence.
The dev is not aiming for a game where the couple has an unhealthy relationship. The original idea was to make the player think there was an unhealthy relationship. Due to players' complaints, most of the "clues" that led the players to believe there was an unhealthy relationship have been removed. Now, we could argue that the couple is not in the right headspace to enter into an open relationship or any aspect of the swinging lifestyle. I would argue that most people are not prepared to do so. More importantly, trying to apply real world, common sense, and hard lessons learned to a simple game where the point is to get a couple into a simple, open relationship, porn scenario will drive you insane. I think we all hoped that this game would be a much more realistic and sensible story about a mature couple entering the lifestyle. This is not that game.