Blindsided after 10 years

I was close friends with 4 women who met when our kids were 3 years old in kindy together 12 years ago. The kids all went on to the same primary school together for 7 years and we became even closer and all lived very close to each other. Playdates, dinners, coffees, birthday parties, school events spent together, very active on group chat and social media together, tears, failures, medical issues, funerals, divorce, house moves, etc. I considered these women my closest friends and tribe after 10 years together and made sure to communicate and maintain the relationships well. 2 years ago one of them suddenly blocked me on everything. When I checked with 2 of the others they said they had no clue why and that they hadn't been blocked. I managed to call the blocker using a family member's phone and they answered and abused me saying I was a horrible person, highly critical, chronically negative, judgemental, main character syndrome, fake, performative, and that everything I spoke about was irrelevant. They said, a number of times, that the other 3 women felt the same way but were too polite or socially obligated to say anything. That they were more willing to 'put up with me'. She said the 3 other women knew all about why she blocked me when I asked them. She accused me of putting them in the middle and trying to manipulate them to 'my side'. She said as soon as I contacted the other 2 women to ask if they knew why she'd blocked me they had contacted her to tell her. I took it all and heard her out completely, apologised and did my best to salvage the friendship, but she said she'd made up her mind to cut me out of her life and would not be changing that decision. My family and I ran into her and her family 2 weeks later at a show and they all walked right past us ignoring us, though it was clear they saw us - so childish and cruel. It's been 2 years now and the other 3 women have each sent me one generic text acting like everything is normal and not mentioning anything about this. I have not replied, contacted them, or seen them. They haven't called, invited me to anything, or posted in the group chat in 2 years. They have continued to Like my posts on social media but about 2 weeks ago one of the 3 unfriended me on it. What would you do? I've never experienced this kind of relational aggression, confusion, hurt in my life. It has made me shrink back from the world and I now have noone at all and feel really alone in life. I don't want to bother with friends ever again because why invest my tine/energy/heart for nothing?