If you are a best friend to someone it means you'll always be there for them; you'll always help them. They inspire you and you encourage them. You help them discover who they are. You're the same around them as you are when their back is turned. You forgive them when they mess up, and you stand up for them. You're always honest and upfront with them in any and every circumstance. You won't trade them in for the newer model. Best friends means you'll stick with them until the end.