Guys what are reasons you don’t smile back at a girl?

Anonymous
Okay, I’m gonna try and make this short lol. so I went to my crush’s job (food place) we have this staring flirty thing going on. So I got in line to order and of course my crush noticed me (he was in the back). He kept lookin at me. This guy got behind me in line and I looked at him once or twice he was his girlfriend (I thought nothing of it). As I was walking away I smiled at my crush when he looked up at me (quickly) but he didn’t smile at me :( I looked at him again and his face was red and his lips were pursed together. I’m not sure why he gives me all these signals and when I smiled at him he didn’t smile back. Why do you guys think he didn’t smile at me.
Guys what are reasons you don’t smile back at a girl?
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