I used to have a rule about relationships: no one got to hit me. It was a bad rule.
I'm not for people hitting me--but: what has to happen for things to get that far? People, in this society, don't make that sort of choice out of the blue. Before that, there is a slow eroding of boundaries, a demolition (until he's trying to get you to stay) of all the things that made you want to be with him in the first place. By the time he thinks he might be able to get away with that--before he has a chance to get away with that--you are invested. By the time things have gotten that bad, you care about him--things are complicated--you know he can do better. And he can.
But he doesn't.
You might say that rule at least worked; no one ever did hit me, who I was dating. But, things got worse in different ways. Any time there's a sharp, clear line, people will find a way to work around it.
Now I have more and different rules. No one gets to threaten me with violence--not by saying something about it, not by throwing things or hitting things or knocking things over close to me, and expecting me to stick around. No one gets to try and change who I am--not even if they're trying to change me into something I want to be. That's my job. And, no one gets to treat me like I'm stupid.
I'm not stupid.