That feeling of being suddenly triggered is the worst. So sorry this happened while you were doing such a constructive thing. It's okay not to interact with the person, and to keep the stress of facing yourself to deal out of your life. I cant even go for a walk with my friend who still sees M, even though I am the one who recommended him before I opened my eyes and started seeing what everyone warned me about. I'm struggling still, missing M yet interrogating myself why such a toxic misuse of authority spellbound me for so long.