How to keep man interested?

It is so hard to understand where is this border between simply flirting, keeping him interested and beeing too passive, negative. On internet and in real life- the same.

Of course, we have to be interesting, without showing all cards, but, in one moment, he just looses his interest and stops fighting for her. When we are too open and flirty, he looses interest too.

How to avoid that? Have you bin in situation like that?
How to keep man interested?
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