Well let me explain you something about people, woman are more emocional and man are more logical. That's why they cry and we don't, that's why they get obsessed for something and we don't, that's why they want everything perfect and we don't care... They live for emotions, we live to reproduce and drink beer!
So since we don't cry\fake cry, we don't know how that can be made, in other works, we don't understand if a woman is faking or not, on the other hand, women knows exactly what others are doing because they do that all the time (i wouldn't say all the time but you get my point).
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And last but not least: What is the social accepted behaviour for a man or PUA to deal with suspicious crying women ? How would yous act ?
Just take advantage on that, if they are fake crying, it's because they want to be hugged, and that's what you should do.
You can spot a liar if they start to overreact over the situation, or there's no tears or red eyes.
Also avoid that fake people, you wouldn't want to mess with them, they can put you on a bad situation quickly, they are fake and shitty, avoid them!