The first option is the most natural, and it means they were probably having an argument or disagreement when they left. You can still use “good terms” and “bad terms” with better grammar. For example, ”I’m sad we weren’t on good terms when we separated,“ and “I’m disappointed that we left on bad terms.” Do you wish you were on better terms with someone? ✨Learn more useful and natural ways of speaking in my special Speaking-Intensive Courses. See you there!✨ 第一个选项是最自然的，它意味着他们离开时可能正在发生争执或分歧。你仍然可以用 "good terms "和 "bad terms"，但语法要好。例如， "I’m sad we weren’t on good terms when we separated," 和 "I’m disappointed that we left on bad terms.”你是否希望你与某人的关系更好？✨在我的特别口语强化课程中学习更多有用和自然的口语方法。到时见!✨