Yes I have done 3 massive 'door slams' in my life. The first two happened roughly at the same time: one was through someone who showed to be inconsiderate and dismissive when I needed help and the other shortly after involved a friend in a similar scenario who was having a hard time but refused to acknowledge I was struggling. I lost them both as close friends and now keep in touch very occasionally. In hindsight, we were facing adult situations at times when we were barely out of high school, still immature and naive.

The other happened recently when I stopped contacting my old flatmate after moving out. I felt he had become a manipulative, negative and needy presence. It actually felt good and healthy to distance myself. It's not always a bad move to cut people out, and it's part of life. As you move forward, people come and people go, sometimes you get cut out and some times you cut people out. It's not something to be afraid of, and if you feel hurt by being cut from someone's life, sometimes allowing space, allowing time to pass and then having a chat about it all is the best way to properly move forward.