I'm not completely sure if this is true either.
But it is useful to know, for anyone involved in an abusive relationship, when hearing/reading your advice, to know that you've never experienced it yourself. I'm not saying it invalidates it, but I do think it's relevant.
Now that I think about it, I've arguably been involved in a 36 year emotionally abusive relationship actually. It was with a close relative.
My way to get out of it was to become as independent as possible and demand respect when things came up and not to just always agree with what was said.
What made it tricky was that all this was layered with true love, and I realized that with the complications of things such as financially that were intertwined for the right reasons and that I need I was truly loved, that I shouldn't close the door completely. However, I should react differently and handle things on my own.