He resented his brother's constant interference in his personal life.

resented 是动词 resent 的过去式。resent 由前缀 re-（表示"再次"）和动词 sent（send 的过去式，意为"发送"）组成，但在这里 resent 作为一个整体单词，意思是"对...感到愤恨、不满"。resented 表示"曾经对...感到不满"。