I'm lost as a mother

My son is 14 and has already been to juvi and is on a first name basis with many of the cops here. He has a probation officer. He's currently at school and I went to his room because it stunk and that's because he left food in his backpack go bad but I found a cellphone that isn't his. Or at least not the one I bought him. I went through it and he had multiple numbers saved but only one had a name and it was Daddy. He still calls his dad daddy so I thought he was talking to his father behind my back but whoever "Daddy" is isn't his father and he was sending explicit photos to this person and has been sneaking out if my house from the sound of these texts to meet up with people "Daddy" found for him to have sex with. I'm pretty sure at least. I means wtf else could "I have someone who's gonna meet you at this motel. This one likes femboys so dress more feminine this time". I tore his fucking room apart and found over a grand under the floorboards I've been crying reading this. I am so at a loss right now. I could yell at him when he comes home. Cry. Scream. I don't know anymore. I'm just so lost