The idiom 'eat one's heart out' means to suffer in silence, often from envy, longing, or unfulfilled desire. It doesn't mean being hungry ('voraciously hungry'), taking action ('decisive step'), or providing insight. The expression comes from the idea of consuming oneself with emotion. Note: the question uses 'one`s' with a backtick instead of a proper apostrophe, but this is a minor typographical issue that doesn't affect comprehension.