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She had sex in my brohteras bed!

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So I have been off and on friends with this girl for about 11 years. She comsiders me one of her best friends and at points I do her. I went away this weekend and she was looking after my dogs. While I was gone she met up with the guy ( we will call him A) and they had sex. It was her 1st time. At 1st they did it in his van then I Found out today, came back to my house ( While I was away) and had sex in my brothers bed! I am furiois! She told me I couldnt say anything to anyone. even to the guy. I am so angry at her and dont know what to do! Should I tell her parents that shes sneaking out in the middle of the night ( shes 15) or so I leave it and hate her in secret?