If a boy smiles at you behind your back tell him "Hey how are you!" if it is Saturday or Sunday.
it probably means he likes you
he is happy
Yes, if your boy/girlfriend is smiling awkwardly and not looking directly at you that means they are lying to you about something.
because they like you
No he dosent it was behind his back
You can test if he likes you by smiling at him. If he smiles back he likes you. If he doesn't maybe not. Another way is by saying hi to him and if he says hi back or looks like he wants to than he is into you. It depends on the guy.
They sell trick rear view sunglasses-try those or stand in front of windows etc facing them with him behind
Break up with your boyfriend because you obviously like this other boy better
That means he likes you. Give it a shot.
It could mean that she was briefly interested in you or found something amusing, but decided to focus her attention back to the teacher. It is difficult to determine her exact intentions or level of interest based on this brief interaction alone.
dancing by a guy/boy, braiding your hair while smiling and leaning on a wall,and growling and trying to kiss that one boy
If a boy doesn't like you, they won't talk that much to you, seem uninterested, no eye contact, no smiling etc.