As you got older, did you have to leave certain people behind and what made you choose to do this?

Back as a teenager and in my early 20s, I was a complete socialite. I thrived on making new friends and still enjoy doing it now. I used to be the person that knew everyone in the cafeteria. I could go from table to table each day and be able to strike up a conversation with anyone.
However, after 25 or even 30, life begins to shift dramatically and change. You begin meeting way less people. People begin disappearing into the woodwork because they've found a partner, or they have kids. Some unfortunately die tragically young.
Others end up becoming new people - sometimes better, but often worse. They get into drugs, or become alcoholics, or become extremely toxic people. I've watched in real time people go from being the popular jock who had tons of friends to being a total recluse who never leaves their house and is now extremely anti social and aggressive.
Growing up and becoming an adult is realizing that if you're doing it right, you can outgrow people you once were immensely close to very quickly. Being an adult is also realizing that you have to cut ties with certain people because they could potentially drag you down.
I swear this is the bittersweet part of adulthood that is rarely discussed in depth.
To those who left people behind, what did they do that made you choose to do so?


Source.