《Ex Factor》的詞曲作者為：Duffy，Mike Del Rio，歌詞如下：
第一節：
Baby, don't you look so lonely,
我敢肯定 今夜會有些許不同，
Cause I'm a girl, I'm a lonely girl,
也許你不適合我，我是寂寞的歌手，
Yeah, we had it all, you know we had it all,
我們曾擁有過一切，你知道我們曾擁有過一切，
But now you're on your own,
但現在你卻獨自一人，
And I don't know what to do,
我不知道我該怎么做，
With my heart, it's breaking up,
我的心快要崩潰了，
I miss you, oh, oh.
我想你，噢，噢。
副歌：
Ex factor, yeah, you were the ex factor,
你是分水嶺，你是那個分手的人，
You were the one that got away,
你離開了，留下我一個人，
But now I'm singing all along,
但現在我唱著這首歌，
Trying to forget about the ex factor.
試圖忘記那個分水嶺。
第二節：
You were my world, my only world,
你是我的世界，我的唯一的世界，
But now you're just a memory,
但現在你只是我的回憶，
And I don't know what to do,
我不知道我該怎么做，
With my heart, it's breaking up,
我的心快要崩潰了，
I miss you, oh, oh.
我想你，噢，噢。
副歌：Ex factor.
分水嶺。
重複副歌。