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

And a friend of mine and his girlfriend lost their jobs two days ago.

BBC: US job losses: Your stories

He allegedly dispatched (rather gallantly) homicide detectives when one girlfriend lost her mobile phone.

ECONOMIST: Official vetting

His plan, though, hit a tragic snag on September 11, when Te'o lost both his grandmother and his girlfriend, the latter to a long battle with leukemia.

CNN: 'Go Irish' vs. 'Roll Tide'