Why would women be unsmiling if they previously smile?

[NicholasRedone]

Sometimes people of an attractive look will smile , and other times they're got cold. Irrespective of I'm single or not, other women will smile as me, while other again these are all fit women, won't smile.

Are they just bipolar or hot and cold or is something up? Lol 😆 "they secretly despise you after the one lustful look from afar* lol 😆

[NordicInScandinavia]

I smile a lot. Like a lot. I'll be sitting on my own doing nothing special and realise I've this big ass smile plastered on my face without thinking about it.

This is something I try to be aware of when in public because a lot of people take my smile as a invite to approach me and start small talking (which I dislike), so when I'm in public and catch someone eyes for some reason while smiling - I automatically go neutral, to avoid any confusion about me being approachable or not. 😅

(Don't know if I'm the demographic for this question since I'm not exactly fit)

[NicholasRedone]

Some would say why the stare bear eyes unsmiling -