Capulet tells Paris to marry Juliet, as he (Capulet) is hoping that it will take her mind off her grief of her cousin's death.
(Although, Juliet is actually more upset about Romeo's exile than Tybalt's death, but her parents don't know that.)
Paris says "Thou must die." and Romeo responds "I must indeed, and therefore came I hither."
"I must indeed, and therefore came I hither." It doesn't make much sense unless you realize that Paris spoke first and told Romeo that he must die.
romeo fights Paris (where?) and Paris dies.
Juliet's father did not know about Juliet's marriage to Romeo until after her death. He was insisting on her getting married to Paris, not knowing that she was already married. And Juliet didn't want to tell him why she didn't want to marry Paris, which made him even more insistent.
Paris believes that Romeo has come to Juliet's tomb to cause trouble or desecrate the site, as he is unaware of Romeo and Juliet's relationship and thinks Romeo is a Montague seeking to disrupt the Capulet tomb. This misunderstanding leads to a confrontational encounter between Paris and Romeo at Juliet's tomb.
Romeo wins. Paris dies.
Romeo stabs Paris in Act V, Scene III of Shakespeare's play "Romeo and Juliet," when he encounters Paris at Juliet's tomb. Paris believes Romeo is there to desecrate the tomb, and they engage in a heated confrontation, resulting in Romeo fatally stabbing Paris.
Romeo promises he will put Paris' body in the crypt beside Juliet after he dies.
Monday
Paris suspects romeo is attempting to desecrate the tomb.
After Romeo injured Paris. Paris told him "Lay me in the tomb with Juliet". Romeo agrees and put him in the tomb with Juliet.
Romeo convinces Juliet that he must leave by explaining the danger of staying in Verona due to their families' feud and the consequences they could face if caught together. He promises to arrange their marriage and reunite with her in the future once it is safe. Juliet reluctantly agrees, understanding the necessity for Romeo's departure.