I knew a woman, a famous motivational speaker. For a couple of years we were lovers. She said she loved me. I was blind with love for her, deep in a rut of devotion. Then one day she gave me a speech. The topic was A Remorseless History of Deceit and Betrayal. Her closing line was a trenchant summary.
She said, "I can't be trusted."
It was a good speech. It motivated me. I walked away and haven't heard a word from her since.