Just before his suicide, Romeo deals with great miscommunications that he has no idea are indeed miscommunications. He also deals with a brand new truth in that Paris had intentions of marrying Romeo's wife without knowing that she was already married. This web of deception would be difficult for any adult to deal with, but for Romeo at the tender age of 16 or 17, this was painfully dramatic. Finally, knowing he intends to kill himself, he had given Balthazar a letter for Romeo's father explaining Romeo's purpose for death; his father's acceptance of his words may have also weighed heavily on his mind.
During Romeo's monologue he looks forward to death so that he can take Juliet back from Death personified:
Shall I believe
That unsubstantial Death is amorous,
And that the lean abhorred monster keeps
Thee here in dark to be his paramour?(105)
For fear of that I still will stay with thee
And never from this palace of dim night
He just wants to be with his woman and there is only one way in his mind, to die.