Juliet takes a poison so she can fall asleep and make it seem to everyone else that she has died. She wants to run away with Romeo and this was the only way to do that. The nurse comes to check on her and finds her "dead". Then the nurse announces to Juliet's family the news.
I must needs wake you. Lady! Lady! Lady! Alas, alas! Help, help! My lady's dead!
Juliet set up for Lawrence to tell Romeo to come and get her when she wakes up. But Lawrence wasn't able to get to Romeo to tell him the plan. So a man told Romeo that Juliet was dead and he believed that Juliet was really dead.
Then she is well, and nothing can be ill. Her body sleeps in Capels' monument, and her immortal part with the angles lives.
Romeo decides that he wants to lay with Juliet and die. He gives all his money to Apothecary to buy this poison.
Let me have a dram of poison, such soon speeding gear as will disperse itself though all the veins.
Such mortal drugs I have
Romeo drinks the poison so he can be at rest with the love of his life.
Here, here will I remain with with worms that are thy chambermaids. From this world wearied flesh. Eyes, look your last.
Juliet wakes up to find that Romeo has killed himself.
Drunk all, and left no friendly drop to help me after? I will kiss thy lips.
Juliet decides to stab herself so she can be at peace with Romeo forever.