In eleventh grade your idea of a good friend was the person who gave you rides in their new car, convinced your parents that you shouldn't be grounded, consoled you when you broke up with Nick [or Drew] or Susan, and found you a date to the prom.
In twelfth grade your idea of a good friend was the person who helped you pick out a college/university, assured you that you would get into that college/university, helped you deal with your parents who were having a hard time adjusting to the idea of letting you go.
At graduation your idea of a good friend was the person who was crying on the inside but managed the biggest smile one could give as they congratulated you.
The summer after twelfth grade your idea of a good friend was the person who helped you clean up the bottles from that party, helped you sneak out of the house when you just couldn't deal with your parents, assured you that now that you and Nick or you and Susan were back together, you could make it through anything, helped you pack up for university and just silently hugged you as you looked through blurry eyes at 18 years of memories you were leaving behind, and finally on those last days of childhood, went out of their way to give you reassurance that you would make it in college as well as you had these past 18 years, and most importantly sent you off to college knowing you were loved.