Why do women with boyfriends or husbands give me a weird smile?

Sometimes a woman will be walking with a man and look back and smile a weird or even sly smile. These are women I’ve never met before by the way. Also I notice dudes hold their girl close to them when I’m around.

I ain’t someone to cheat with someone. So why do they do it?

Why do women with boyfriends or husbands give me a weird smile?
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