A spouse is somewhat different. If a cop responds to a domestic dispute, they can usually remove the partner they believe to be the aggressor for a period of time even if no crime has been committed.
In my experience, the issue is with the courts. It is difficult to get an order of protection, and even if one is granted, they are difficult to enforce unless they are violated. State law invariably favors the female in these situations, as they should.
I agree the courts are a huge issue. And that may be why the cops do nothing to help because they know the courts will screw it up. But either way the cops don’t really help much in many circumstances