I would say that friends and acquaintances tend to change as you evolve and hold different views of the world.
As an outgoing person, I used to have a lot of friends but now, I’m more focused on my family and building things than socializing.
Progress over perfection.
Some people might be stuck with an idea of “you” that doesn’t fit with who you’ve become.
Also, I might getting older (definitely) and wiser (hopefully)…lol.