Why some girls are so furtive in eye contact? [+advice to shy girls trying to make an impression)

I mean, why some of you get so nervous about it? If a guy it's also glancing at you, it's OK to glance back, no need to be weird and turning your head in a "i don't like you way" or looking down (I already met 2 girls that acted like that and liked me).

If a guy you find attractive is giving you the eye, don't be shy and look back, and try not to break too soon. It's so intense when a girl maintains it for a long time, I get this "love high" and just getting really interested and pumped up to get to know her better. Just a tip, don't be shy girls.
Why some girls are so furtive in eye contact? [+advice to shy girls trying to make an impression)
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