Never overreact if he called your name to get your attention. How many names could he have uttered/called during the entire day? It is just a simple greeting. Period.

Never over-process any simple act of him, like when he looked at you. You see him walking with his friends 50 ft away from where you are standing. You watch him from behind and then he looks back! Oh! He was checking on you! Engk! No! Maybe he just looked back to say something to his friend behind him. You can never be sure where were his eyes fixated during that time. Remember, you are 50 ft away.