My dad has been reading my messages secretly?

[hailey beth]

Okay so my dad has been reading my messages and I have NO IDEA how he's doing it! He never looks through my phone.. but he knows everything! While I'm at school he'll text me and say things that there's absolutely no way he could know about it unless he's reading my messages. He knows about everything I've done, who I'm with, and everything I'm planning on doing and it drives me crazy! I have absolutely no privacy and I need too know how he's doing it! I want to know if there's a way I can stop him from doing it.. PLEASE HELP!
just called my phone carrier and they said it is ILLEGAL to invade someones privacy and that there is no way to read the messages without a court order to get them.
And if he is doing it illegally what website is he using? could i report it or something?