I will give a slightly different spin to what they are saying although it really does not change anything they are advising.

It is likely that she has wayward thinking.
That other person could be an imaginary person in her head.
It could be a fictional character from a book.

There is no way she will admit to it and if it
is a fictional hero from a book, you are not likely to
be able to compete with that person.

Follow the advise that is given here.

DB'ing is counter intuitive and that means doing 180's from what you think you should do.
Stop pursuing, stop begging, pleading and bargaining.

DETACH and LET GO.

Me-70, D37,S36