If your relationship keeps leaving you confused and small, this names what you are dealing with.
One thing first: this is not a diagnosis, and you cannot diagnose someone else with it. What it can do is help you put words to the pattern you have been living with, so you understand why nothing you tried ever seemed to work. Use it to make sense of your own experience, not to label another person.
Answer based on how your partner usually acts over time, not one bad day.