<human>:  Why did Cleopatra kill herself?
<bot>: She was a ruthless ruler who was a threat to the Roman Empire. She had a lover named Antony, who was a Roman general. Cleopatra wanted to rule Egypt, and she knew that if she married Antony, he would be able to help her gain control of Egypt. She also knew that if she killed him, she would be able to rule Egypt as a single woman. She had him killed so that she could become queen of Egypt.