1. They call you for every little thing, even if that includes when you're scared to walk home alone.

2. They don't date anyone unless they have your seal of approval.

3. It has been that way since before you can remember — it kind of just happened.

4. There is no such thing as a normal picture between you two.

5. When they come back from a trip, it's like they never left.

6. You became best friends over the dumbest things.

7. You need them to be there 24/7.

8. With all of the important best friend things.

9. But, don't worry... you know they're the only one that can truly pull you back together.

10. You encourage them to always have a good time.

11. Just like they do for you.

12. You give the best compliments to each other.

13. And when they cry, you know someone is about to die.

14. You're the only one that gets her.

15. And she's the only one that gets you.

16. You're the keeper of all her secrets...most of the time.

17. Because she knows the dirty details about you that no one knows.

18. She's the one you go to when you need someone to have your back.

19. You go on the best adventures together.

20. And nothing compares to when you two are just out on the open road together.

21. Because she IS your pain in the ass.

22. But you know she'll always be there.

23. She's your person.

24. Sometimes it might just scare you how alike you are.

25. You know they'll always be right there in the friend zone.

26. And that's exactly where you need them to be.

27. Let's go be psychos together.

28. It obviously takes two...

29. Because she's the Blair to your Serena.

30. And the Miley to your Lily.

31. Without her, you just wouldn't be complete.