But when we're going to set an exact date to start this project, she gets a very negative attitude . . .
I think that indirectly you've hit on a central BPD trait, which is general negativity. She's prone to complaining about all sorts of things, right? She gets attention when she complains, and so she might actively find things to complain about. She says she hates the carpet, and yet she also hates the idea of replacing it, because of the change, disruption, temporary discomfort and maybe the cost. Yet she pesters you to take care of the carpet, to have her needs met, while also controling you (and getting extra attention from you). But when you take action, she delays . . . maybe to defer making a decision, to avoid a disruption, and also to reclaim your attention. For the moment it sounds like the carpet is her primary worry. But if it weren't the carpet, it would probably be something else, maybe something that you did "wrong" in her eyes.
Here's another related BPD trait: not really knowing what she wants. That might be linked to a poor sense of self, as well as shifting moods.
There's another explanation, which is the desire to have her cake and eat it too. It's impossible to replace a carpet without pulling out the old one. She wants both but can't have them, and the cognitive dissonance is making her grumpy, making her change her mind.



He was definitely selfish in that movie. He isn't a victim. Made a silly choice that came to fruition then ran with it in the face of horrible events. Super good movie for anyone into supernatural horror! It would trigger all of us given our pasts.