destruction of deceit

I am always hurt to discover one whom I had thought trustworthy is not. Each time destroys a little of my faith in humanity. My relationship with that person is forever changed for I can no longer believe on faith what is said , and all past interactions are re-examined for darkness and deceit. Trust is such a simple and fragile thing , so long to build, so quickly destroyed. Even if one's home environment was not conducive to teaching honesty and integrity, it is something which can be learned . One can always rise above and be better, especially when shown by word and deed a more positive way to live.