After a few minutes of this quiet back and forth, she starts sobbing and crying while she is talking. His side of the conversation is not angry at all, his tone of voice is reasonable. It might be him breaking up with her, or he may be her shoulder to cry on. I don't understand the words, and here are no real cues.
The conversation ends, they take their (soft) drinks with them as they leave. They walk close together through the parking lot, past my car. She notices my license plate. She looks back and sees me looking at them, then they move on. I think she was wondering how much of her conversation I understood.