Why did Johannes Brahms never marry?

Johannes Brahms remained a lifelong bachelor, and the reasons for his decision not to marry are not definitively established. While he had a close relationship with Clara Schumann following the mental illness of her husband, Robert Schumann, this relationship did not lead to marriage.12

The closest Brahms came to marriage was an engagement to Agathe von Siebold in 1858, from which he recoiled suddenly, never again becoming seriously involved in the prospect of matrimony. Scholars suggest several contributing factors for his choice:1

• Personality and Temperament: Brahms possessed an immense reserve and a natural irascibility that he believed would have made him an impossible husband.1
• Emotional Expression: He struggled to express emotions outside of his music, leading to a "concentrated inner reserve" that often hid his deeper feelings.1
• Desire for Independence: He expressed a specific aversion to the domestic dynamic of marriage, writing in a letter that he could not bear to have a woman in his house who had the right to comfort him or be kind to him when things went wrong.1