Here's your thinking:  I'll snoop once just to make sure and that will be it.  Ah, but you'll get the urge to snoop again, and again, and again.  And eventually, if you keeping looking, you will find something you don't like and then you'll feel justified in being disrespectful, dishonest and untrustworthy.  You'll have found exactly what you were looking for from the beginning:  a reason not commit yourself to a relationship in the first place, a reason to shop around a little more, because you're not ready.  Love is an act of faith to begin with.  How can you expect someone to have faith in you, if you can't have faith in return?  If you have this urge to snoop and be deceitful, then you're not ready for a real relationship in the first place - you haven't matured - A LOT OF PEOPLE NEVER DO.  You might be one of these people, or maybe not.  Time will tell.  But rest assurred, if you get caught snooping, your boyfriend/girlfriend will never be able to completely trust you.  And most likely,  the resentment will grow over time and he/she will dump you, or if they're smart - Dump You the second they find out that you don't trust them and have no respect for their privacy.  My advice - grow up - or spend your life moving from one unhappy relationship to the next (like most people.)

GOOD LUCK :)