It's tricky to say definitively what a guy means when he looks at you and smiles to himself because it's highly context-dependent. However, here are some potential interpretations:
He finds you attractive or interesting: This is a common and likely reason. The smile could indicate he's admiring your appearance, personality, or something specific you're doing. He might be thinking about approaching you or simply enjoying the view. See more information about being considered generally <a href="https://www.wikiwhat.page/kavramlar/attractiveness">attractiveness</a>.
He's thinking something positive about you: Maybe you said something funny, or he remembers a pleasant interaction you had. The smile could be a reflection of that positive thought or memory. This could be linked to general <a href="https://www.wikiwhat.page/kavramlar/positive%20thinking">positive thinking</a>.
He's amused by something related to you, but not necessarily at you: He could be smiling because he's remembering something funny that happened to you, or he might be amused by the way you're interacting with someone else. The important thing is that the humor is not malicious.
He's feeling shy or nervous: The smile could be a way of masking his feelings or avoiding direct eye contact. He might be interested in you but unsure how to approach you. This might be because he is naturally <a href="https://www.wikiwhat.page/kavramlar/shyness">shyness</a>.
He's lost in his own thoughts: It's possible the smile has nothing to do with you at all. He could be thinking about something completely unrelated and just happened to glance in your direction.
How to Interpret It:
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