Why does my friend reinvent history to believe whatever she wants to believe?

A friend of mine who I’ll call Tina seems to have reinvented history to convince herself that my best guy friend who I’ll call Jack, wants her friendship, even though he’s made it very obvious to everyone that’s seen them together that he hates her.

I could tell, because Tina asked me to specifically ask my friend Jack to join us for dinner at a local diner. Why do people reinvent history, to believe what they choose rather than accept reality, to this extent? While it’s harmless, isn’t it also pointless? What does it achieve? She also believes that she’s the most beautiful and the brightest in our social group, to the extent where she thinks she can model and become a doctor (she’s not).

Updates
1 y
I genuinely don’t see the point in her believing all of this when it’s not true, as it is pointless.
Why does my friend reinvent history to believe whatever she wants to believe?
Post Opinion