What if a guy sits close to you but decides to sit somewhere else?

People move for several reasons. He wanted to sit next to a friend, he had to move to see or hear better, he just likes to be further away from the teacher or closer to the front, the AC is blowing on him or he needs to have the vent over him, the lights were bothering him, he was getting a reflection from the window or door or he just wanted to move. Don't internalize these sort of things because they often do not reflect who you are or if he likes you or not. It just happens.