I’m 26, I don’t usually go through people’s phone but recently I stumbled on my 18 years old sister’s phone. So I went through her whatsapp chat with a guy I’ve been suspecting she’s having something to do with. Earlier this year I advised her about relationships generally when I found out about him. Now going through her phone I found out she’s having s3 x with him now. What do I do? Should I confront her? Or just keep quiet and allow her experience life?