Is Trust Overrated?

I randomly asked one of my friends, who ironically I trust a whole lot, if he thinks that trust is overrated. I have been picking at the concept of the term "trust" and its place in our lives today. I agree with my friends response and think its safe to say that trust has been watered down so much that in a way, it is overrated. Like my homeboy said "smoke 2 blunts and laugh with a bitch, suddenly she's your sis and she's telling you bout her private life." People are really grimy and will do shit behind your back that they think you'll never find out about. And whether you do find out about it or you just have an intuitive feeling that something is off, the truth will always be unknown. I'm the type of person that isn't quick to believe something if I wasn't there to witness it with my own two eyes. So if I trust you, it just means that when I ask you what the truth is, I'm going to accept whatever you tell me. Knowing that I probably won't ever know what really happened, that there is always more to the story than what the other person is telling me, I question the value of trust. Is it something that chicks use to comfort themselves while their man is cheating on them? "I trust him, I don't gotta worry..." Is it an excuse or a defense mechanism for someone who got caught doing dirty? "You don't trust me, why would I lie to you?" Is it for the naive at heart? "I feel like I could trust you so I'm just going to share these secrets with you" Is it just an old school value that we are struggling as a generation to keep up with? "Trust is key to a relationship.... Now let me know the password to your Twitter." What is it? What do we really mean when we say we trust someone? I can't trust anyone with my life and the skeletons in my closet (that we ALL have.) Does that make me heartless or just socially aware? To me, trusting someone means that I'm aware that they could completely fuck me over, and they might even currently be fucking me over, but I like them enough to stick around until I'm aware that its happening/has happened. Is that pessimistic of me or realistic? Am I supposed to ignore the chance and possibility of me getting completely fucked over because I "trust" someone? I'm sure an older and more wise person will read this post, knowing the meaning of trust and call me a fool. Maybe I haven't lived enough to know. But as of right now, I go by this quote "Who can I trust in 2012? Thats no one, not even myself, a Gemini screamin' for help."