What was the main cause of the Fall of the Roman Republic?

Gaius Julius Caesar was born on July 13th, 100 B.C and was assassinated on March 15th, 44 B.C. He was a statesman, general and writer, considered by some to have been the greatest man of all time. Julius Caesar was also a lawgiver, an orator, a historian and a mathematician. His government (with slight modifications) endured for centuries. He hardly ever lost a war; he fixed the calendar; he created the first news sheet, Acta Diurna, which was posted on the forum to let everyone who cared to read it know what the Assembly and Senate were up to. He also instigated an enduring law against extortion.

In addition, Caesar defied the murderous dictator Sulla; was captured by pirates whom he crucified after his release; and waged war against the people of Gaul (modern France and Belgium) who didn't side willingly with the Romans. In fact, he even wrote about it in his third person account known as the Commentaries on Caesar's Gallic Wars.

With Marcus Licinius Crassus and Pompey, Caesar formed the first Triumvirate ( a political regime dominated by three powerful individuals, each a triumvir). However, when Caesar crossed the Rubicon (a river), he faced Pompey as an enemy. Crossing the Rubicon also caused him to be him a traitor to Rome. After defeating the senatorial forces led by Pompey, Caesar became the leader of Rome, soon taking the title of dictator.

He was awarded divine posthumous honours, titles, statues and the status of dictator for life (dictator perpetu

The fact that Julius Caesar was treat "like a god" may have been a reason for his assassination.