Beautifully written.
You are adhering to your kindness mantra in blocking this person. You’re being kind to yourself, which is absolutely as important as kindness to anyone else!
For whatever it may be worth, I think you did the right thing.
Even if you didn’t have the background of trauma and consequent issues that you do (and I share), self preservation should be a priority. Walking away from someone who affects you negatively in the way this writer has will never be the wrong move — and is by far the healthier choice. Well done for protecting yourself.