Do You Ever Forgive a Beater?

If a man, or woman, puts their hands on you, is it automatically curtains for the relationship?
People fight everyday; over money, over custody, over nothing, but it's for the most part verbal.
But ever so often confrontations turn physical. And when they do, the harm is superficial or deep and longlasting, but either way it usually signals the end of the union.
Should it?
Should you ever keep a "friend" that has proven that he or she will jump on you?
Some people may say that once someone touches you then a sacred line has been crossed and you're better off living -- before you get killed! I can't disagree with that sentiment. However, the old folks have a saying also: If he'll lie, he'll steal; if he'll steal, he'll kill.
So, from that viewpoint, a liar will dead you too.
The moral of the story? Stay away from Cheaters.