The 29-year-old "So Yesterday" singer started dating Jason Walsh this summer after meeting at the gym.
The couple called it quits last week, parting ways amicably, according to Us magazine.
It is not clear if Walsh will continue to train the singer/actress now they're no longer dating.
The short-lived relationship marked Duff's first official romance since her divorce from Mike Comrie, the father of her four-year-old son, Luca.
She split from former ice hockey player Comrie in January, 2014, after four years of marriage, and they finalised their divorce in February this year.
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