Why did your closest/longest friendship with your best female friend end?

If that applies. Of course

My bestie ditched me after she got married at 40. We'd been super close since we were 14! I got married, had kids, but she was still my best friend. Then she got married and just drifted away, poof! Last straw was her deleting all her social media and not adding me to her new ones. I tried to stay in touch, but she was totally uninterested. It hurts, but oh well.