How well do you know...

A person. I mean really know a person. Is it even possible?
In this age of accessibility - Internet, Facebook, myspace, blogs, craigslist, chats, texts- how is it possible to truly trust a person when there is possibility and temptation everywhere...
You hear these stories of people cheating, having double lives etc and on one hand you think how can the other person not know... But how could they know? Unless you low-jack your significant other and their phones/laptop etc - how could you know?

What really makes someone "tick"? What are their interests that they wouldn't tell anyone? What would they do if they didn't think they would get caught?

Can you answer those questions of yourself? Is there anyone who could answer them about you? Does anyone really know anyone else...?