Hailey Glassman tells the syndicated television magazine show "The Insider" that the one-time reality TV dad takes out his anger on her. She says he throws "mantrums."
Adds the 22-year-old: "He's like Jekyll and Hyde. But I still love him."
In a statement to the show, Gosselin says he regretted "any pain that my actions have caused her" and that he was committed to making things right with Glassman, his ex-wife and kids.
Gosselin, who filed for divorce from wife Kate in June, was part of the TLC show "Jon & Kate Plus Eight," chronicling their struggles raising eight children.
Glassman spoke to "The Insider" in a two-part interview airing Thursday and Friday.