Why did he look at me like that when I said that?

I think this guy had a bit of a attraction towards me and it showed.. I was starting to like him too

i was on the phone talking to a guy and he was around next to me. I told the guy on the phone. “You always have to call me back bye” I said it jokingly. Even tho he’s the one who calls

but the guy looked at me quickly in a weird way after I said that. I felt a bit embarrassed lol

Why did he look at me like that when I said that?
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