Branh0913, you are absolutely right! Oddly though, "we" don't always do the right thing.
On the flip side, to answer her question, i don't believe that in every case "once a cheater, always a cheater". I believe people take certain paths in life as a means of discovery. We make choices that are not always good, but sometimes, those choices were made subconsciously to teach us about ourselves or about what we truly expect out of life.