What I know from attending lots of meetings, is that the addicts I know often speak about feeling "less than". Not because the world treated them unfairly (though that is often the case), not because there is any reason to feel that way... they just do.
I think it is part of the disease of addiction. I wonder if the lying is just another one of those ways of trying, desperately, to be as good as we think we HAVE to be in order to fit in? Most of us know about the arrested development thing... that emotional immaturity that happens when addicts begin to use. Couple that immaturity with an incredible feeling of inadequacy... I guess then I am not SO surprised.
Generally, I don't think the addicts I know are lying in order to harm me... to be honest, I don't think they can get outside of their own pain and needs long enough to even consider how their lies affect me. In fact, as most of us have witnessed, the lies usually come back to hurt the liar.
Just another perspective... ((hugs))