Can any smart + experienced guy out there explain to me the difference between friendly flirting and serious flirting?

Anonymous
what is the difference between FRIENDLY FLIRTING and when a guy is serious about the girl and FLIRTS to expect some in return..?

so many girls out there get led on all the time and then become heart-broken, including me, only if we knew the difference between when a guy is just being casual and friendly, or really into us...

what is the difference?
Can any smart + experienced guy out there explain to me the difference between friendly flirting and serious flirting?
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