I hope dude had cameras in his house for evidence. It's your word vs her word. They will always side with her. Most of the time its him rocking her.
I had an ex that literally fought me like I was chick she had beef with all because she could express herself well enough. I didn't hit her once. I grabbed both of her arms to stop her from attacking me. She then started tussling with me and snatched part of my beard off. After this she said "I should call the police, you have scratches on me. How dare you fight a female. You push me on the counter and attacked me." Straight lying. Luckily I started recording on my phone and capture her admitting that I didn't hit her. She told her parents I hit her and I played the recording for step-pops. Open Shut discussion.
Chicks fight wild, so even if you trying restrain her, bruises will be left.