My Stomach Sank

I have a daughter who is studying overseas. My ex wife and I broke the marriage off soon after. I hate to say this but secretly I wanted a son, and maybe I deserved this. I regret not giving my daughter much time, I was always busy focusing on work. A few weeks after the divorce, I cleaned out their rooms. They had left a few things that they no longer wanted and where okay with me getting rid of them. I found an old iPhone in my daughters room that was hidden under her bed. I figured it was hers and was planning on asking for permission. I ended up charging it and powering it on. I wanted to reset the phone initially, was planning on selling it, I needed the money. My curiosity got the best of me and I started going through it... I found pictures and videos of her having sex with different boys. Or so I thought, one of the videos had a much older guy that was getting a blowjob from her where she used to work. She must have been seventeen, I doubt she had finished school yet. I was angry, disappointed, and did not know what to do. I went through her messages and confirmed some of the guys she was talking to lived in the neighborhood. At least one of them was married, and there was enough messages to assume she was cheating on her boyfriends. I would have never guessed, to me she was always focused on school. Nerdy, gorgeous, shy and always active. Her phone was giving me a different story and I felt sick. Some of these guys called her a teen nympho. I hope she isn't this way overseas but i don't have much hope now.