So i had this friend of mine, like an year back we were really good friends then for almost 3 years later she quit social media for like an year and a week ago she was back on social media. So we were having a kind of great conversation with flirting and all, today was her last exam and this morning i got a message from her account, i was sure it's not her because it was her exam at that time, later i came to know that her friend was using her Phone at that tim6and she read all our private texts since then I'm really pissed off on her, I believe it's invasion of privacy what do you think should i do?