Why the Cleopatra kill herself?

Cleopatra killed herself because she thought that marc anhonty was dead but he wasnt when i was in school me teacher told me that cleopatra killed herself by an asp (snake) because she didnt what to be killed by the romans. Marc did the same because he was scared and he didnt whant to die he also old us that julis cesar whanted him dead because he wanted to rule the roman land and ruin Egypt. 4,000 years later Egypt had a new sort of a King. Mubark then was gone because Egypt did not whant him anymore after that egypt was then attacked by the milltray and that was only 19 days before Mubarak was gone. It was all Mubak and the goverments fault and then loads of people were posined what the hell is happning in the world