People who lie

As most of you know, I hold one thing close to my heart. That is honesty. I do not tolerate it from my family or my friends. I will cut someone off in a heart beat because of ONE lie. If you can't be honest with me, you don't need to be my friend.
So this being said, I just found out one of my "friends" (I'm using this term loosely), lied to me. I suppose you could call it a lie by omission. For those who don't know what that is, it means, Lying by omission means allowing another to believe something that one believes is false, by failing to reveal one's belief, rather than by being untruthful. Hence it is normally classified not as a lie but as an act of deception.
Now comes the hard part, do I confront, and see if they have the balls to admit that they lied to me or if they come up with a nice story of "I didn't know".

Some have asked me over the years why I do not tolerate someone who lies, even if it is for the well being of others. The main reason I abhor it is because my childhood was full of lies. Well, let me rephrase that. We had to "pretend" all was well. We overlooked the fact that I never knew my father until we moved to Virginia, we never spoke of Daddy drinking that one extra beer that put him into a fit of rage and beat the shit out of us. And we damn sure plastered a smile on our face come Sunday when we went to church. We looked to be the All-American family, yet it was nothing but a bunch of bullshit lies. This is the major reason I hate lies and deception.

I myself try my damndest not to lie. Even if I know it will hurt a person, I will not lie to someone. My friends hate me at times for this, especially when it comes to covering up for them. I have lost relationships due to my blunt honesty. But when it comes right down to it, I can sleep at night with a clear conscience. But then again, I have been told many times that I don't have one of those.

To wrap this up, I am at a loss as of what to do. The last few days have not been kind to my friend and I. We've trudged through and came out on the other side, still friends. But I don't know that we will get through this one.
I guess if my Daddy didn't teach me anything else, he did teach me to stand up for what I believe in. And I believe that friends do not lie to each other, under any circumstances.