Why did she do this to me?

[Bob]

why did she lead me on and say we were friends but all the time we never were then she completely turned into a different person and started doing things she knows she isn't supposed to be doing?


I know this question might be confusing but it's just for opinions cause I'm in this situation.

this girl pretend to be my friend the whole time cause I was giving her great attention then out of nowhere she started changing she did/still does things but she wasn't who she was when I met her? I told her I liked her and before I think she wanted me to make the move but I was shy and she doesn't like shy guys she likes guys who already have experience she told me. she hid herself from me before she was a kind teenager she became a bad person now and the things she does is taking dirty pictures of herself and putting it on social media or sending it to online people she doesn't know. (she recently did that and they exposed her) she drinks vodka and smokes weed like why did she turn from a nice kind girl to a slut? not to mention she isn't a virgin she had sex and she only is 15.. I cared for her so much now I just don't know why she wont take the time to just look at herself now and stop.
Plus I'm in high school still grade 10 year!!