Well, theres this thing called friendship,
although it may be easy to find friends and people you can enjoy life with, a lot of the time that friendship gets abused, your "friends" find someone else they would rather be with, even if they can't admit it or have promised they never would.
Memories mean a lot when this happens because the time you have spent with that someone will never come back and will never be as true.
That person has placed their priorities somewhere else, somewhere 90% of the time they won't be appriciated. You will say you wil be there for that "friend" no matter what but when they betray your trust, when they lie and backstab you, that friendship has been betrayed and comes to an end.
The sacrifices you make will become meaningless and you will learn that they are not worth making.
The friends that put you first no matter what and tell you the truth no matter what are worth your time and can be called best friends. No matter what happens in your life and how much time you spend with these people, they will stay close to your heart, they won't lie, won't snake and won't backstab you.
Choose your friends wisely and when you learn that someone is trustworthy, make sure they are your friend forever, because these people are not found easily. Trust is the key to every relationship and when it's abused the relationship is not worth your time.

A best friend is the most special thing is your life, treasure them and cherish every moment you spend with them.