ughhhhh why

Soooooo yes, I know this is bad. But I've been going through my boyfriends phone behind his back, when he's in the shower, when he's sleeping. Just to make sure he isn't doing anything that I would, ya know. Well, he recently caught me and now he's hiding his phone and changing his passcode. I now, seriously feel like he's hiding something. What do I do? I already tried confronting him and he keeps saying that he swears(!!) that he isn't hiding anything. I'm so confused guys. I really need help.