Adultery is kind of the point of this season, emphasized with those weird totems that were explained to us in EP 1. If that's not your cup of tea, I totally get it, depictions of cheating make me uncomfortable too, but the showrunners clearly have a vision of how they want these characters depicted. They're not glorifyin it though, I'm not sure that there's a single sympathetic character in the show, and that's the point they're trying to drive home. Think 'Its Always Sunny' but in a dramedy.