Flirting for fun vs. flirting with intent. Or is there any difference?

[Demmurts]

What are signs of flirting with intent, compared to flirting just for fun or for an ego boost? Or is there really any difference? 'Cause girls have acted really flirty, and acted all interested, just to give me fake numbers. Or is a fake number the only real clue they were flirting just for fun, without intent?

 

[nismo-4]

You must call their motherf**kin' bluff!

 

[Cremasta]

It doesn't really matter. Just flirt right back.
If you think she's started out just flirting for fun, be shameless, she might get so caught up in the game that she forgets to eject.

 

[nroug7]

"So if I call this number right now your phone will ring"
And no she didn't leave her phone at home/anywhere else.