Guys, aside from narcissism what has a guy talk about himself Non-Stop or is it just narcissism?

Like I'm to go out for coffee with cousins or something of colleagues that are trying to set me up. And I find that this guy will not shut up about themselves. To the point where I'm honestly not listening.

And we haven't even met it's been on the phone

Is it narcissism or nerves or what is it?

Guys, aside from narcissism what has a guy talk about himself Non-Stop or is it just narcissism?
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