You know those times when you meet someone and you just click with them? You don't know how it happens, but you instantly become best friends. Some of those friends stay and some of them go, but this only shows you who the true ones are. Here are 30 signs that your best friend now is your best friend for life.

1. You always seem to know exactly what each other is thinking, and sometimes it can be quite scary.

2. If you aren't thinking the same thing, you're saying the same thing at the same time.

3. You talk every hour of every day, yet when you see each other you act as if you haven't spoken in weeks.

4. If someone crosses one of you, the other one will always there to have your back.

5. You support each other no matter what the circumstances are.

6. Everyone knows that you're each other's BFF because you're always together.

7. She knows every little secret about you, and vice versa.

8. She laughs at everything that you say, even when nobody else finds it funny.

9. She always shows up to your house unannounced because she knows you don't care, but even if you did she'd still show up anyways.

10. The few times that you actually go out without her, people continuously ask you where she is because they're surprised she isn't with you.

11. She knows when something is wrong with you without even having to tell her.

12. You don't care about being crazy in public together because neither of you is easily embarrassed.

13. You can't stay mad at each other and you apologize the second you get the chance.

14. She's your biggest supporter even when you seem to doubt yourself.

15. She never judges you, even in the times when you know she probably should.

16. You see each other as sisters instead of best friends.

17. You're 100% comfortable around each other.

18. You unknowingly wear matching outfits when you get together.

19. You have a never ending list of inside jokes that you share with each other.

20. You can go weeks or months without talking to each other and still pick up exactly where you left off.

21. She's the first person that you call when you're in trouble.

22. And she's the first person you call when you have awesome news.

23. She's practically considered part of your family.

24. There's never a dull moment when you're together.

25. You know their wardrobe from the inside out and you've worn pretty much everything she owns.

26. There is never a time when one of you doesn't owe the other money, but you have hope that it'll just even itself out over the years.

27. You've already planned out what you're going to say in your speech at their wedding.

28. Your ex is her biggest enemy, and she would have killed him if you had let her.

29. You trust them more than you trust anyone else.

30. And finally, no matter how hard you try, you've learned that you just can't do life without them by your side.