15. You Plan Your Life With Them In Mind
Whenever you see your future, you always see them being in it and you know that regardless of what path you chose to take, they will support you no matter what. Even if you wanted to quit your job and be a professional bum, your best friend would sit down with you and go through the pros and the cons. She also helps to plan your life out anyway because she knows you so well that she understands what will make you truly happy; even if that means you going across to the other side of the world to find yourself on the back of an elephant or something.