I am talking with someone. 肯定句:Your parents didn't like you dating with your ex-girlfriend. 疑问句:Why did your parents not like you dating with your ex-girlfriend? 没有同时出现do 和be 动词的。
有 比如 I am playing football with my friends。 而你这句的助动词只能有一个,而且用dating是因为like+doing形式, 应该是 Why did your parents not like you dating with your ex GB? 要么是 Why were your parents not liking you dating with your ex GB?