If a girl is too pretty to you like have very seductive, sexy eyes or just so pretty in the facethat you would hardly look at her? Like wouldn't make much eye contact because maybe nervous? or if a guy does this and the girl is very attractive, what could be some reasons why he won't make much eye contact?
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This is actually due to our primal instinct as mammals. If we feel intimidated by some one, (beautiful women, bully, boss), we won't make eye contact or break eye contact right away. Among most mammals this is a common signal to show submission. The person avoiding eye contact is showing the other person they are of a lower status than the person who is not looking away or breaking eye contact. But this isn't always true though, you should also take into consideration the speed at which eye contact is broken. If a person slowly and casually breaks eye contact with you they might not feel to nervous around you, in fact they might not even really care you're there at all!
In the end these things are rooted in a person's current psychological state. If the person is very shy they might get nervous with anyone in a social situation. Maybe they have low self esteem, which leads them to feel that they're not worthy of other peoples attention. The reasons go on and on.
If you still want to know why people do this I would suggest reading some stuff on body language, it can give you a real insight as to why people behave the way they do.0