He hung in there WAY longer than I would have. At around the time he said "I think we're done talking here, bye!", I'd have blocked her number. Successive texts and calls would have gone into the digital-toilet (drop call, no response). Most people give up after a few of those.
I'm a bit sensitized to the 'crazy bitch girlfriend' scenario because I had to call 911 and tie them into the conversation when some gal tried to pull that with a guy I worked with. I'd fielded the call when we knew what was going down. He was young and impressionable, and would have fallen for that "I'm gonna kill myself" crap. I, on the other hand, had the cops show up at her house after a few more minutes with the 911 operator listening to the conversation as I was telling her that there was NO way that her beau was going to answer the phone AT WORK to this type of abusive and psychotic relationship, and threats of suicide aren't very endearing. He had a restraining order put out on her after that incident, at my urging. They waived the $25 fee.