You have grown closer to other people.
It’s pretty well known that in life, we like to pair ourselves with people that are most like us. As you get older, you may realize that those same ones you were close with don’t share your same goals and/or character. As you begin to move up in the world, you need to be surrounded with similar friends who are mature enough to accept your life and the goals that you want to achieve. Finding new friends with the same goals will take you further in life.