TIFU in friendship

Sorry, English is bot my native language (Here we go rus-eng translator) Today I found myself completely alone in terms of friends. This may sound stupid or something, but I was left without my best friend. That's how it was. I proposed to my boyfriend (now fiance) and we decided to tell our two best friends about it. We decided that rings are not what we would like to mark our marriage with, but earrings are what suits us. A year ago we told both friends that earrings were our option. Therefore, in order to tell about such a joyful event, we decided to show our friends devices for home ear piercing (not the best option, we still think, but at that time we decided to stop there). our friends started shouting at us that piercing our ears at home was not safe and bad (fairly). One of my friends said that she would find us a piercing specialist herself, as long as we didn’t suffer from crap. But we began to hint to our friends that they had misunderstood something. This made them both furious. One left in hysterics that we were so stupid and didn’t want to do what she thought was right. And the other one remained waiting for the outcome, I told her that I had proposed to my boyfriend. and the earrings are our wedding rings. When another friend heard this, she started shouting that she was always the last to know everything (specifically the part about the earrings). But this is not true! My fiance and I were offended by this selfish behavior. Another friend, who didn’t throw a tantrum, told me a couple of days later that I was the one who was wrong about everything. I asked why she was telling me this if our mutual friend acted like a bitch and ruined such an important moment for us simply because of her selfishness.She replied that she was just taking care of her family. I asked how it was, she called everyone her family - that friend, me and my fiancé. But it turns out she lied to me for two years about the fact that I was also her best friend. called her a threat to our common friendship and that only that selfish person is her best friend.My heart is still broken, I have lost my friends, of whom there are so few. And all simply because I decided to defend my borders. In the end, both of them pretend that everything is normal and only come to me when their other friend can't hang out. Or when they need some help. and all the time I felt like I was superfluous, but I didn’t admit it to myself. I just need to talk it out because it really hurts. It's hard for me to make friends and even harder to lose them. What do you think about this situation? and sorry if it’s too unclear and chaotic( TL;DR: I lost my best friend because I defended my personal boundaries in front of our mutual selfish friend. In the end, it turned out that it was this selfish woman who was more important than me. Now my heart is broken and I feel sad all the time(