10:09 AM PT -- Kristin Evans -- Stacy's ex -- is vehemently denying Stacy's claims that she "staged" the attack ... saying in a video statement Monday, "I don't know how you can stage getting your ass beat."
Evans added, "This is what abusers do. They will make you seem like you're the crazy one and that they're the victim."
Evans said she also had an issue with the way the officers spoke with Stacy in the video ... saying she was "upset" that it appeared the police were "consoling" the ex-NFL player during the arrest.
"Everything about this makes me uncomfortable," she said.
Zac Stacy told cops the brutal attack on his ex was all "staged" ... claiming the woman set him up because she was "bitter" he didn't want to be with her.
The former NFL running back's conversation with officers was all captured on police video, obtained by TMZ Sports, just days after he ruthlessly beat his ex at her Florida home.
In the arrest footage, Stacy can be heard speaking with Orlando Police Dept. officers for several minutes about the events that led up to the Nov. 13 altercation ... insisting it all "was staged."
"It's just a case of just bitterness, man," Stacy told the policemen. "That's why she did this. The whole assault thing, she staged it. She set me up."
Stacy continued, "The whole thing was staged. All she's trying to do is get money out of me. She got a reaction out of me."
Stacy explained that he believes his ex -- the mother of his months-old son -- was upset with him because he didn't want to continue a romantic relationship with her.
The former St. Louis Rams and New York Jets player told officers the woman knew he wasn't in a good place mentally (he said he had just gotten out of rehab for anxiety and depression), and she used that to get "a reaction out of me."
"She knew I was down, she knew I was going through anxiety and depression," Stacy said. "She knew I was trying to close this gap that's between me and my son and she's just upset that she got caught and she's upset I'm not taking care of him like she expected. And now she took it this far."
Stacy added, "This is just a case of just girl is just bitter that I don't want to be with her and she's just trying to destroy my whole reputation 'cause of this s***."
Stacy then told the officers he knew his actions were "f***ed up."
"I don't know what man -- how any man could have handled that situation," Stacy said.