I have rarely ever in my life hit anyone, male or female, but I am also aware that there is a culture of overreaction in this regard that has sprung up in modern decades that is just ridiculous. Clearly people should not try to hit each other, but that doesn't mean the moment it happens, the other person should go run to a shelter. It's silly. Yeah, she said she started crying, but probably more as an emotional reaction than anything. She said her arm was red. I can hit myself only moderately and make my arm red. That doesn't mean anything.

As I've said, if it's something that happens anything more than extremely rarely or he actually shows a real attempt to harm her then there's a problem. Otherwise, I don't see what the issue is.