Our expert says:
Doesn't sound like delusions of grandeur, which would be when someone is sincerely convinced that they are terribly important ( maybe like some politicians ? ) and they wouldn't necessarily feel the need to talk about that. You seem to be talking about a habitual liar, maybe a compulsive liar, who tends to lie about almost everything even when it doesn't put him in a good light or make him seem special --- he may lie even when it will pretty obviously get him in trouble / be found out, and not only when it will definitely benefit him
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