Why did Benedict Arnold go to the British side?

Benedict Arnold defected to the British side primarily due to disillusionment with the American cause and feelings of underappreciation by the Continental Congress. Despite his significant contributions to the American Revolution, he faced criticism and lack of recognition, which fueled his resentment. Financial difficulties and promises of a commission and monetary rewards from the British also influenced his decision, leading him to seek a more favorable position with the enemy. Ultimately, his betrayal was motivated by a combination of personal grievances and opportunism.