Why did Thomas Edison breakup with his first wife?

Thomas Edison and his first wife, Mary Stilwell, faced significant challenges in their marriage, including Edison's intense work schedule and frequent absences due to his inventions and business ventures. Their relationship became strained, particularly after the death of their son and other personal difficulties. Ultimately, Edison's focus on his career and the emotional toll of their family life contributed to the deterioration of their marriage, leading to their separation in 1884.