I have this friend who i have known for about 3 years. We are, or were, really close and she could tell me anything, as could i her. About a couple days ago i found out that she has had sex mulitiple times with her boyfriend of 6 months. Only problem is she barely turned 15.
I didnt find out from her that this happened. I had to find out from a girl that doesnt like her at all. At first i didnt beleive her because...well, this chick talks a lot of crap. But i asked my friend and her boyfriend if it were true and she denied it. Later on her boyfriend told me it was true. My friend didnt know he did,.
I asked her a second time to see if she would actually come clean about it to me but she still denied it. She lied to me twice! what kind of friend lies to you about something so serious? i thought of her as my best friend but i dont know what to think of her anymore.
Not only did she give up her virginity to someone who she isnt going to marry, but she lied to me multiple times. I also hear and see that she is becoming another person, someone who i dont know at all. i am starting to think that she was all along being fake to me throughout our whole friendship. i dont now if i should tell her that i know and that her boyfriend even confirms it to be true( that way if she tries to deny it i have proof) or should i just not talk to her at all? Im confused..

what should i do?