Just anothrr rant about “friends”

So I have a friend who is in all honors classes and she acts all preppy and nice and innocent but when she gets around me she acts her true self (cursing, talking shit, laughing, making jokes you know the normal stuff us teens do). So we were in school in the hallway and she cursed and one of her teachers walked by , so she ran around the corner hiding to make surehe didnt know it was her. As she was running she told me not to say her name outloud because she didnt want her teacher knowing it was her who cursed and I said whatever and I turned around and saw no one in the hallway. She said to me im serious don’t do it so I said her name and she got all mad and I told her I checked and no one was around to hear. She said oh he was near by blabla bla. So we got Into an aargument and basically my whole thing is that she can ALWAYS tell me what im doing wrong and what I NEED to be doing and she can NEVER own up to her wrong doings but if I say something about what shes doing wrong or what I think she should do its ” oh brittany I dont do anything wrong thats all you ” she just blames me and I HATE that so much , like dont sit there and try to tell me about what im doing wrong when you cant even take credit for your own wrong doings