Unfair fight with friend or not?

[Billy]

Ok so hi my "friend" are fighting she says that it's no big deal but it is to me so here's the story..... A few days ago my friend wanted my Facebook password so she could read my messages with the guy she likes I said no because I didn't want her going through my personal conversations so yesterday she asked the guy why his Facebook password is and he gave it to her I told her NOT to go through his messages and she said she wouldn't so a few min later she txts me bac and says I went through your guys messages. And I said what did they say so she told me everything she read and then I got mad and told her I told her that was none of her business and she shouldn't have done that she said it was no bug deal but she was invading my privacy and his today she is telling me she never read them and is telling all my friends that I'm blaming her for something she didnt do and now most of them hate me (my real friends hv stuck by me) she is changeling the story. Am I being unreasonable? Thanks!