When I was younger I used to cut people off when I felt wronged by them. I noticed that some friends I had tolerated irritations with some of their friends. My friends had more friends than I did, I got fewer and fewer friends from abandoning people, and I came to suffer from loneliness. At that point I began thinking my habit of cutting people off wasn’t a good one, and I tried tolerating minor issues with my friends. I agree with letting go of friendships when you can’t stand being around their other people, but ending friendships can easily be overdone. You end up alone, lonely, and without any emotional support. Nobody is perfect. I think having friends and having friends long term means learning to let go of at least minor stuff.