当雅思老师情侣决定分手时，以下是一些建议的表达方式，旨在保持尊重和温和：

直接而诚恳

"I think it's time we talked about where our relationship is going. I've realized that we're not the right match for each other."

表达感激

"I want to thank you for the time we've spent together. You've been a great companion, but I don't think we're meant to be."

避免伤害

"I don't want to hurt you, but I feel we need to make a change. I hope you understand."

明确未来

"I think it's best for us to part ways now. I wish you all the best in the future."

保持冷静

"Let's keep our conversation professional and respectful. I don't want our personal issues to affect our work."

结束语

"I hope we can remain friends. Good luck with everything, and take care."

请记住，分手是一件敏感的事情，重要的是以成熟和体贴的方式处理。