I've had this happen so many times. I'll always chat back and forth with a girl through text or OKCupid, set up a date, and have them tell me last minute that they either forgot or that something came up.

What's the correct response? Be upset because they wasted your valuable time? Be calm because people make mistakes and you can go hang out with another girl (abundance mentality)? Next her?

What about for the girls that seem like they are eager/excited to go on a date?