Upset Girl: "I am such a bitch" Boy: "No you're not, you're a wonderful person" Girl: "But I'm not!!!" starts crying. OR Girl:" I am such a bitch" Boy: "Yeah, you kind of are" Girl: "Well fuck you too asshole!" starts crying. There is just no way to win that, amirite?
Or just don't date psychotic women.
Get her pregnant. That would solve everything,
ask her why and have a conversation about it