He’s sometimes nervous around me, and sometimes relaxed and smiley?

[KezHarris]

I think it’s weird because other peoples behaviour around me is pretty much the same. I dunno.

[NathanDavis]

maybe he just drinks too much coffee... ?

https://www.youtube.com/embed/mu8b5H6pDKo

[OfMiceandMen]

That sounds pretty normal to me. He may be a little nervous bc he likes you, but once he starts talking to you the nerves go away and he smiles bc he enjoys your company.

[bowenw]

He may just be shy or nervous around women he likes.

[GoodGuyBreakingBad]

He most likely wants to blow his load in you.