On Saturday at 11 pm, she said she wanted to spend half an our watching a movie and putting clothes away. . . She then told me she just wanted to finish watching one scene. Several scenes later, she said, "Oh, I said 'scene' but I meant 'sequence.'" . . .She didn't really break her promise because she really promised something completely different from what she told me she was promising!
This sounds exactly like my 5yo! "Just one more segment! Not a whole episode!"
I agree with going back to marital counselling. Keeping things tidy is a major challenge in our house as well, with my wife often refusing to do things she usually *would* do, because I'd asked, and denying that something that previously bothered her is a problem once I say that it bothers me. It lets her cast me as the bad guy, the tyrant who expects her to slave away constantly to keep the house clean, no matter what is going on with her. And promises, mine or hers, mean what she says they do-- arguing about this does not have a helpful result.
The only solution I've found is not to engage about it. The house doesn't get cleaner right away, but when the choice is messy house, or messy house + huge fight, I'll take the house without the fight, and thank you. Things that absolutely have to get done, I do myself. As things de-escalated, she has started keeping the house up to her own standards again. If she's said she would do something, and she doesn't, she'll sometimes be able to participate in a problem-solving conversation about how to get the task done, as long as I don't bring up the fact that she'd said she would do it. As in, "Hey, I'm feeling kind of tired and ready to go to sleep. It is hard for me to sleep if the bed is covered in clothes and the TV is on in the room. What are your thoughts about how we can handle this?"
It's not fair or appropriate not to be able to count on what she says, or explicitly acknowledge the discrepancy between words and actions. But I've found that direct confrontation isn't usually helpful. If she confronts me about something, I try to validate the underlying feeling, "You seem really upset about X, which makes sense because Y," and then redirecting it to joint problem solving: "What do you think we can do so X doesn't happen again?" That works a good percentage of the time, for me.
Hope you can find something that works for you. But things got better for you guys before. If nothing else then this, too, should pass.