Interpreting someone's emotions based solely on a smile can be challenging since smiles can have various meanings depending on the context and the person. Without additional information, it's difficult to determine the specific meaning behind your friend's smile when your names were mentioned by the teacher.
However, I can offer a couple of possible explanations:
Positive association: If your friend smiled when both your names were mentioned, it could indicate that he has positive feelings associated with you and your friendship. The mention of your names might have triggered pleasant memories or thoughts, leading to a genuine smile of happiness or fondness.
Inside joke or shared moment: It's also possible that the mention of your names by the teacher reminded your friend of an inside joke, shared experience, or something humorous between the two of you. In this case, the smile could be a reaction to that specific memory or connection.
It's essential to consider the broader context of your friendship and your friend's usual behavior to better understand the meaning behind the smile. If you have a close relationship with your friend, you might feel comfortable asking him directly about his reaction and how he felt when your names were mentioned. Communication is key to understanding each other's emotions and strengthening your friendship.