What does it mean when a man stares at you?

I was walking through a room behind my friend. We were talking and I saw this man walking towards us. He ignored my friend, and was staring at me the whole time he was coming towards us. He was staring at my face/eyes and I glanced at him a few times, until he eventually smiled and said hi to me. He was fixated on me and didn’t avert his gaze. Even my friend pointed it out and thought it was odd.

What does it mean when a man stares at you?
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