My long-standing friendship of 40 years (from age eight to 48) ended because it just became very hard work.
Over the years, she and I could have differing opinions about anything I.e., matters regarding our families, attraction to partners, where we wanted to eat, politics, which university and university degree was better, anything and we had the space to air our opinion and we would hear each other out. On many occasions, we could understand each other's point of view and sometimes change, or meet in the middle or disagree totally but respect each other anyways.
Over the years, she's gone quiet extreme in all her viewpoints (politically far left then far right!!) and slowly she stopped having discourse and became judgmental and started shouting me down for everything. Suddenly, my political leanings were wrong, my choice to be a divorcée and mother was shameful and I was wrong for remarrying, it was wrong that I became a SAHM, it was wrong when I returned to work, even my choice of food and my hairstyle was wrong, she criticized my parenting and on and on...it wasn't that I minded disagreeing because we often did but she just didn't want to hear me but was definitely more inclined to constantly tell me that she was more enlightened than me and the human race. I felt like I was being repeatedly punched over and over again. I couldn't take anymore.
She was my first friend when I moved to our neighborhood and we used to laugh and have so much fun together over the years. It did break my heart to tell her that I simply couldn't be friends with her anymore and she wasn't happy but accepted it. She actually said she would miss me and that was that.
Our mutual friend, whom I've been friends with for 43 years and still going strong, said the friend did take on what I said over the last day to heart and has stopped and evaluated her behavior. She's still extreme in all her views but less so now. Maybe because I was one of many people who walked away.