The characters who were responsible for Romeo and Juliet matter their sentiments and secret marriages are the members of the Montague and Capulet families.
We can arrive at this answer because:
However, a secret marriage prevents the couple from living together. Also, Juliet's family arranged another wedding for her (since they didn't know she was married). This sparked Juliet's plan to fake her own death, which resulted in her and Romeo's actual death.
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