Job search advice for possible PhD dropout
Way too many personal details may look unprofessional. You might try something like


  I was not satisfied with my progress in academia, and I do not want to lose any
  more time by trying. I believe I can fully utilize my productivity and develop myself better in the industry, by the help of financial means.


This is both honest, motivational, and looks less pretextish. 
Not everyone will care about what you lived in your personal life.