Overly Friendly and Flirty girls

I consider this a real problem with women in all age groups. IT is unbelievably huge problem when trying to identify girls who actually like you and girls who just want to be friends. I wish that girls would just act normal around you and show that they are not interested instead of being happy all the time and giving you mixed signals. Of course I realize this doesn't apply to every girl out there but still it is very confusing.

My question is how do you identify who is overly friendly and flirty from the girls who actually are interested in you?

Who agrees and disagrees and why?
Overly Friendly and Flirty girls
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