Why did Giordano Bruno leave the Dominican order?

Giordano Bruno left the Dominican order primarily because his unorthodox attitudes and intellectual pursuits led to accusations of heresy.1

During his time at the convent of San Domenico Maggiore, Bruno developed an annoyance with theological subtleties and began openly discussing the Arian heresy, which denied the divinity of Christ. Consequently, the provincial father of the order prepared a trial for heresy against him, prompting Bruno to flee to Rome in 1576. His situation worsened when authorities discovered forbidden commentaries by Erasmus in Naples that contained marginal notes written by Bruno, leading him to flee the order permanently.1