1. No matter how ugly you look, they will absolutely not care.

2. You are there for each other at 3AM during your existential crises.

3. You walk into their place when they're not even home.

4. When you get hungry, you just walk right up to their fridge and take whatever you please.

5. When a new bae starts hitting you up, they're the first person to stalk them on every form of social media.

6. Your family is their family and their family is your family.

7. That moment when you leave each other and it hits you that you're not together.

8. You can ALWAYS count on them to be the first to comment on your new profile pic saying how hot you look.

9. The look you give each other when that girl you both hate says something irritating.

10. The nonsensical methods of communicating you do with each other that nobody else understands.

11. When something awesome happens to them, you're so incredibly happy that it may as well have happened to you.

12. On the other hand... when they're sad, you're devastated.

13. Those car rides where you both jam out to your favorite song together.

14. When someone's talking shit about them, you immediately have their back and defend their honor.

15. Whenever you're sad, they're at your door right away to comfort you.

16. One of you always owes the other money, but you'll both pay the other back "at some point".

17. Whenever one of you becomes close with another person, you must remind each other not to worry and that they're still your BFF.

18. You trust them more than you ever thought you could trust someone.