Life changes very fast. Sometimes too fast for us to even take in what's going on. One day you're living in one place, and in the blink of an eye, you're in an entirely different state. The next thing you know, you're graduating high school without the people you grew up with, surrounded by people who you never thought could exist, going off to college. It just all goes by so fast, and we don't always realize it until it's too late.
The last few years have definitely been years of learning. Learning that someone you had been friends with for so many years, probably doesn't even think about you anymore. Learning that, as time goes on, people grow. Some people you grow out of, some grow out of you.
Friendships teach you a whole perspective on life that no textbook or family member could. They teach you the entirely platonic side of a relationship. The one where you go to movies or roller skating just because. They teach you that some people will look at you like you belong on a pedestal, while others will simply use you for their entertainment until someone "better" comes along. Friendships will teach you how to cope with heartbreak, death, or even something as simple as a bad grade. They will also teach you that not everyone has your best interest at heart and that some people are only around for their own benefit.
You're bound to lose friends over the years. Yes, even the people you swore you'd be friends with forever. You won't necessarily lose all of them, but over time, you'll lose your best friend from primary school or junior high. You may even lose the ones that live in a totally different country. Sometimes it's a lack of communication, sometimes, your friendship just goes up in flames with no real explanation.
You will look for closure for years, sometimes you will get it, sometimes you will not. Some friendships ending will haunt you for years because you never know exactly what you did. Some you will be over in a few weeks time. The healing process of losing friends is entirely different for everyone.
For me, every friend I've lost will hold a special place in my heart. Whether it be my kindergarten best friend, my junior high best friend, the ones I lost touch with after high school, or the ones who live on the other side of the world that I just don't talk to anymore, every single one will always be a little part of me. Now whether that's helpful or harmful is up for debate, but one thing is for sure, regardless of where I am in my life, or my old friends are in theirs, I will always miss them, and I will always be there for them. Regardless of just how fast our lives change.