I read about the "INFJ doorslam" a few years ago on a list-serve or website, and it definitely resonated when I considered my own behavior. The idea is, the INFJ will get so fed up with a person that she'll totally shut that person out of her life. I have done this a couple of times (so far, permanently) when I have felt deeply betrayed or hurt. My anger can be formidable, but instead of railing against the betrayal, I simply shut off and shut out. It feels like it's necessary for survival in the moments when I make the decision, and from other people's perspectives, it seems really cold and heartless. But usually by that point, I have been patient/forgiving/receptive, and then I say "Screw it. You're out."
I also do this with break-ups, but it doesn't tend to be permanent in those cases. I just have to shut out my exes for a time so that I can clear my brain and heart of them. I didn't do this with the ex I lived with, but he also moved to another town, so I didn't really have to.
Does this sound familiar, INFJs? Do you do this?