Relationships take an incredible amount of maturity...it took me a while to figure that out.
2 things here (and I'm not taking sides without facts): 1. If she did attack him and 2. Not leave when asked + call the cops, then JT may want to peacefully part ways with this girl. My wife has been really pissed at me before but has never laid a hand on me. I think the worst I got was a chicken nugget to the head one time, lol.