Please help, ASAP friend help.?

[sarena4me2001]

Of course it's my fault I think.. So my bestfriend gave me her facebook account a week ago so i could gain her more money on a game named meez.. And then one of my other bestfriends which is also my bestfriend's friend begs me for her facebook account.. so i tell her that she can have it unless she doesnt tell my bestfriend, doesnt check her notifications, but only her messages (thats what she wanted to do on the account) Then now, shes telling my bestfriend's bestfriend that she called her ugly, and she liked a dude and told him on facebook... And now i feel like its my fault that I gave my other bestfriend my bestfriend's account on facebook... now i feel super guilty and dont know what to do and i dont want to get my bestfriend even more upset admitting to her i gave my other bestfriend her password...... She changed her password but i still dont know what to do... help
when i say give it to her i mean my bestfriends password.