I told my bf...I snoop?

[Greth]

OK regardless of what he said, just for a second, imagine in reverse. How would YOU feel if HE hacked into YOUR fb account and read your messages "because he was curious"? Not even necessarily because there was something specific he wanted to look for. You'd feel uncomfortable at the invasion of privacy, right?
What you did was NOT good. Even though he said "that's fine", I can bet you he's not 100% OK with it, he's just one of those men who doesn't want to get drawn into an argument (I know this kind of man because I'm one of them). Apologise for what you did and then NEVER do it again. That's no way to be if you want a lasting relationship. What happened to trusting someone until they give you reason not to?