What does it mean for a boy to bite his lip subconsciously when he is looking at you? What does it prove that boys squint a little when they peek at girls?

Squinting is the object that boys want to see but are embarrassed to see openly (in fact, it has been exposed, psychological effect);

Common likes girls' movements: girls will look away when they come over or face to face, and then turn their heads immediately;

Will pretend to inadvertently promote the girl's name and chat for a long time. ...