Did you consider the possibilty that the woman may have been a victim of abuse and what you were hearing was her response to that? Many abusers are well practiced at keeping their manipulation and emotional cruelty well below volumes audible to passers by. Then they get to come across as the nice guy who is the victim of abuse from a crazy screaming banshee. None of us really know what goes on behind closed doors so it’s best not to make assumptions.