1. You stop locking doors.
Maven Pictures
Or closing them at all, really.
2. You become very direct about bathroom supplies.
3. You start mimicking each other's sleeping schedule ... and sometimes do it together.
NBC
4. You reserve one day a week for ordering delivery and watching Netflix together.
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instagram.com
Probably you didn't even realize it was happening, but now every Sunday is SAVED.
5. You develop your own getting ready routine, and a LOT of it is talking.
CW
You've even divided up the mirror.
6. You have sleepovers because sometimes you stay up so late talking that it's easier than going back to your own bed.
MTV
7. You become co-detectives in the ongoing mystery that is your lives.
8. You end up seeing, um, a lot more of each other than you planned on.
Universal Pictures
9. You get a little homesick whenever you two have to separate during the daytime.
Fox
10. You make mistakes.
NBC
Even the best of roommates can't be perfect ALL the time.
11. You go out to get coffee or a snack for yourself and come back with something for your roomie-BFF, too.
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instagram.com
Because know you know all their favorites.
12. You start speaking and gesturing like each other.
Fox
And neither of you notices at all.
13. You borrow each other's clothes. Sometimes without asking first.
Fox
What's yours is theirs.
14. You text each other from your beds.
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instagram.com
Doesn't matter if you're only 20 feet away.
15. You have an emotional send-off any time one of you goes out of town for the weekend.
Disney
And a whole WEEK? Forget about it.
16. You give each other plenty of heads up.
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instagram.com
... and sometimes decide to just let the other person deal with it.
17. You accept that one of you is just always going to be the better cleaner of the two of you.
Vh1
No passive aggressive notes needed.
18. You get very interesting ideas for things to do when you're both still fully awake at 2:00 AM.
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instagram.com
No one else will understand, but whatever.
19. When you argue, it can get a little vicious.
Paramount
Nobody knows how to push your buttons like they do.
20. But your make-ups are quick and involve lots of hugging.
Disney
Omg I'm so so so sooooooo sorrryyyyy.
21. Neither of you can talk about the idea of NOT living together without starting to cry.
NBC
NOTHING CAN CHANGE.