Question: Why did she stay?
What victims hear when you ask that: Only a stupid person would let it get to the point of him hitting you. You can’t let anyone know this happened, or they’re going to ask why you stayed. Your pain is already great, and having people imply you’re stupid and you did this to yourself will just make it worse. So, you should conceal the abuse and pretend everything is okay. Otherwise, people are going to wonder how you could be so stupid.
What to ask instead: Why did he continue to hit her after he promised he would never do it again? What kind of man does that? Why does lying to someone he supposedly love come so easily to him? Why is hitting her more important to him than keeping his promises?