What does it mean when a girl sits on a guys lap and he starts shaking?

babygurl09
there is this guy I know when ever I sit on his lap he shakes

and when I talk he smiles at me

he put his arm under my head once.

someone told me I intimidate him.

he told my friend that he has a girlfriend but he told me he does not.



he is shy.

What does it mean when a girl sits on a guys lap and he starts shaking?
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