Thats an interesting question. I never looked at it as being "triggered", but i think you are right, thats what it is. Being overwhelmed, unable to deal with the emotions, fight, flight, fawn, or freeze - any of those will pretty much kill a relationship, won't it? But im always, this is b.s., this person isnt worth it - what is "it", anyway? Emotional dysregulation. To get on an even keel again, i cut people out of my life.