The apothecary is very poor and looked like he had not been eating. Romeo offered him alot of money way over the average price for the poison. The apothecary says, "my poverty but not my will consents," which means i really need the money so ill do it but my conscience says not to.
Rosaline.
He drinks the poison.
She kissed his lips trying to get some of the remaining poison for herself.
Balthazar tells Romeo that Juliet is died (he [Romeo] doesn't know about the Friars plan) and Romeo goes back to Verona to see if it was true. This leads to Romeo's death.
She is afraid she might wake up in the tomb before romeo comes to rescue her. A+