Before me, my ex-girlfriend dated a guy who turned out to have assaulted several pre-teen girls (his saxophone students, as he was a music teacher/musician). He still had French citizenship so he left the country and probably would not be extradited back to the US. Supreme douche for whom I have no sympathy.
Barton's another and more complex story, I would say, which leaves me more shocked and disgusted because in personal exchanges, he was far, far from an asshole/douchebag. My ex's ex, on the other hand, seemed like a shithead well before all this stuff went down.