Hi again Saidbh: She blames me says I was invalidating and flies into unbelievable rages.
There can be confusion regarding validation/don't invalidate. In this context, validation should relate to acknowledging feelings, but NOT agreeing with false information:
i.e. "I see you are upset". "I'm sorry you are upset".
NOT: "It's my fault, I'm sorry." (if it isn't true)
Some people believe that you have to agree with their position on something, their false reality, or their lies. Someone with BPD may expect and think that agreeing with their false reality (as opposed to feelings) is validation. Never validate something that is false.
The lesson at the link below on "Don't JADE" can be a good strategy to use when angry rages occur.
DON'T JADE (Justify, Argue, Defend or Explain) and avoid circular arguments