Why would someone lie about coming to your invitation and not come?

You invite someone to either your b-day, a party, a wedding or whatever event. Just the day before they tell you they're coming.

Then they don't show up, don't even apologize and act like nothing happened, not even greet you, ghost you or invite others to different events, not even mentioned you. What type of person is that? Lies about coming the day before, doesn't show up and acts like nothing happened.

Why would someone lie about coming to your invitation and not come?
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