Zac Stacy’s ex-girlfriend revealed that she is suffering from PTSD since the ex-Jets running back allegedly viciously beat her in front of their child.

Kristin Evans also said in an interview that her 5-month son has experienced “behavioral changes” since the Nov. 13 assault at her home.

The horrifying assault was captured on camera and quickly went viral — and the woman told The Sun that the disturbing footage triggers post-traumatic stress disorder.

“It’s very difficult reliving the trauma,” Evans, who saw the video in a recent news interview, told the publication.

Evans, who is studying to become a psychologist, fears her baby will suffer long-lasting effects from being in the living room during the attack.

“Will he remember the event itself? I doubt it,” Evans said.