Confused.

My boyfriends starting to be really moody with me lately. Like today he took me home from school and we were sitting in the car at my house. At first he was happy. But then all of a sudden he seemed mad. And he started being rude and making comments like how he wouldn't doubt that I'd have sex with someone for 25 cents. Then he was happy again and then back to mad. I'm really confused.  Like he went through my phone and there was nothing bad on there. He did delete some pictures which kind of upset me. And then he made me log into snapchat which I never use and then was mad because I had lots of snaps from guys. I don't get why he was so mad. I didn't hide anything. And I didn't even snoop through his phone. I just had it