Head nod, eyebrow raise, & smile?

I have a crush on this guy and he walked into the room and stared at me as soon as he walked through the door till he got sorta close and I was smiling the whole time. he gave me a long head nod and rose his eyebrows then looked at me and started smiling. he then walked quickly, grabbed something and walked out. we sext occasionally but have a really close relationship (not dating) what did he mean by it?
Head nod, eyebrow raise, & smile?
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