If she's using ChatGPT to try and understand behavioural psychology, she's not smarter than him.

It would be one thing to go off and do some reading and come back with some resources and functional strategies for OP to avoid argumentative fallacies and navigate civil discourse, but she's using a biased generative AI to armchair diagnose her boyfriend.

"you don't have the emotional bandwidth to understand what I'm saying" okay, so what if he doesn't, now what lady? Does ChatGPT have a self development program so your boyfriend can develop the emotional intelligence required to converse with you?

Picking apart an argument is not how you resolve an argument, ChatGPT is picking it apart because she's prompting it to do that, where as a therapist or couple's counsellor would actually help address the root issues of the argument.