Talks only about themselves
An hour over lunch and they haven't asked you a single question. Every topic you start comes back to them.
Rule out first
Nerves on a first meeting. A crisis they're working through. A role (a pitch, an interview) that requires it.
What could explain it
Social anxiety: They talk to fill silence and fear pauses; afterwards they worry they talked too much.
ADHD in adults: They interrupt and go off on tangents, but are genuinely interested in you when reminded.
Autism in adults: Long, detailed monologues on a special interest; they don't read the cue to stop but welcome questions.
Grandiose narcissism: You're an audience. Your stories get one-upped, and they're bored when you talk.
Vulnerable (covert) narcissism: Monologues of grievance about being overlooked; they need sympathy and don't return it.
I–It (Buber): You're an audience, not a person: no follow-up questions, nothing you said is remembered next time, and they warm up only when you can do something for them.
A next move
Tell them something important about yourself and watch. Interest means anxiety or ADHD; a pause and a return to their subject means autism; a one-up or boredom means narcissism.
If it’s you
When did I last ask someone a question and listen to the whole answer?