Unfortunately, on the next episode, we saw Joey walk out on her during a heated argument and it sounds like that wasn't the first time they've had a knock down, drag out fight.
According to RadarOnline, Joey reportedly broke Katie's nose during a domestic dispute. "They had physical problems during their whole relationship," a source tells the site.
Apparently, Katie's mom called the police after one especially bad argument, but charges were never filed because Katie didn't want her daughter Molli to be stuck in the middle.
Fortunately, it sounds like Katie has learned to keep her distance. "She's never really put herself in the situation where she has been alone with him [again]," their source explained. "When they exchange Molli, they meet in public places and stuff like that."
Hopefully Joey is able to work through whatever anger management issues he might be having so that he never ends up hurting anyone again.