Answer: Because Romeo drank all the poison without leaving any of it for her to kill her self in the same way.
Explanation:
In the fifth act, scene 3, as Juliet wakes up and realizes that Romeo is dead, she says:
'What’s here? A cup, closed in my true love’s hand? Poison, I see, hath been his timeless end. O churl, drunk all, and left no friendly drop
To help me after?'
She calls him selfish because there´s no poison left, and she wants to die in the same way as him. Finally, she takes his dagger and stabs herself.
