First of all, if a guy stares at you for longer than a second or two, he's definitely thinking something.
A blank expression though, could just mean that his eyes happened to wander over to you, while he was thinking. It could mean absolutely nothing.
On the other hand, it could mean that he wants to stare at you, but doesn't want to seem interested? Haha, I have no idea. Sorry.
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It could mean a variety of things, such as he is interested in you, trying to figure you out, or simply lost in thought. Without more context or additional cues, it is difficult to determine his exact intentions.
It could indicate that the person is observing you from a distance but feels uncomfortable or shy when closer to you, which is why they avoid making direct eye contact. They may be interested in you but unsure of how to approach you.
It could mean he is interested in her or finds her attractive. It could also mean he is simply paying attention to the conversation.
It could mean that the guy noticed you staring at him, and when his friends look in your direction, they might be teasing him or trying to figure out why he caught your attention. It could also indicate that they are observing his reaction to being stared at. These reactions can vary based on the individuals and the situation.
It could mean that the guy is unsure about his feelings for you or is sending mixed signals. It might be helpful to talk to him directly about your feelings and see if he is willing to clarify his intentions. If the pattern continues without clarity, it might be best to reassess the situation and consider if it is worth pursuing.
It could mean that the guy is shy or lacks confidence in approaching the girl directly. His actions suggest that he may have feelings for her but is unsure how to engage with her.