true friend-you talk to her and never get bored..you share good and bad memories of your life,and your deepest secrets....you know her family in and out n she knows yours...you go out together,to watch the movies and stuff!she always give you a smile(enemies fake theirs)you fight and realise the fight is not worth it,talk and laugh about how you missed sharing while she was away,how jealous she was when you were talking to some other girlsetc.and if she is your true friend she'll do the same with you...talking from experience
Basically, what I have found is that my oldest friends are my true friends. They have stood the test of time, and have been there in crunch. That's how you know.... They also stood a few misunderstandings, and blatant "bad stuff" as well, and are still hanging in....
If you have to ask that question its probably obvious
If you Google this question, you'll learn the answer.
Only in times of great turmoil can that be answered