In Act 3, Scene 2.. Juliet anticipated her wedding night with Romeo. Unfortunately, when the nurse entered Juliet's room, she announced that Romeo is dead. He died after killing Tybalt.
Juliet sent the nurse to find Romeo corpse. She gave the nurse her ring so that the nurse will return it to Juliet's "one true knight."
Juliet wanted Romeo to visit her in spirit to bid her his last goodbye as she believed him to be dead.