Flirting

What does it mean when a guy gives you a smirk smile?

So these guy mike I was flirt if with wedsday and I started giggling when I was checking out is butt and , when I went to get a drink of water then when I came back I looked over and mike smiled at me but kind of like a smirk smile , why did he do that. I was blushing a lot that wendsday
So does it mean anything? I made him a braclet that day too I gave it to him.
What does it mean when a guy gives you a smirk smile?
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