Because she was he's old girlfriend. And he is very sad to have lost her.

因为准新娘是他的前女友。而失去她，对于他来说是一件痛苦的事。

When 课堂 - SpeakingMax英语口语达人

For those of you who are on the run from the FBI, your Visa has run out, or you're sitting next to your ex-girlfriend, now would be a good time to put a paper bag over your head.

被FBI通缉的,签证失效的,还有前女友就坐在旁边的,赶快找个纸袋子把脸给蒙上

耶鲁公开课 - 博弈论课程节选