DALLAS — Johnny Manziel’s ex-girlfriend said in an affidavit the Cleveland Browns quarterback hit her so hard during a late-night confrontation she lost hearing in one ear.

Colleen Crowley’s affidavit, published online Monday, says Manziel dragged her into a car last month after she tried to get away from him. Crowley accused Manziel of striking her in her left ear.

Crowley detailed the alleged attack as part of proceedings to obtain a protective order against Manziel, who is under criminal investigation on allegations of domestic violence.

Manziel, a Heisman Trophy winner whose professional career has been marred by headlines about his drinking and other personal issues, is expected to be cut by the Browns next month.

In the affidavit, first published by TV station KXAS, Crowley said she and Manziel had a confrontation in his hotel room around 1:45 a.m. Jan. 30. Crowley accused Manziel of throwing her onto his bed after the two discussed him “being with a girl who had caused us problems in the past.”