how is romeo and killing tybalt is a reason why romeo and juliet died

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I suppose that Romeo's banishment after Tybalt's death, and his ensuing secret marriage to Juliet were the reason for Juliet's pretend death.... thus, if you look back may have indirectly caused the death of both lovers. Regardless, I believe there's a lot more at play here..... neither Romeo or Juliet made the best choices.