I have some ideas to answer your question;
stares at you which seems for a very long time
When you see him staring he looks the other direction or smiles back at you.
Laughs with you or teases you
His pupils dilate when he looks at you
He figits when speaking to you
Acts nervous
Blushes, stutters ect.
stares at you which seems for a very long time
When you see him staring he looks the other direction or smiles back at you.
Laughs with you or teases you
His pupils dilate when he looks at you
He figits when speaking to you
Acts nervous
Blushes, stutters ect.