Why this guy stared at me while talking to his friend?

Anonymous
He is my crush, I'm his crush (totally sure about it) but he seems to be too shy to even talk to me (as his friends tried to push him into me).
Last day, I was alone, waiting my bus and my crush came with a friend to wait it too as we take the same bus, a few meters next to me.
At the beginning, he didn't look at me but, then, he turned his body towards me and started to stare at me (my profile side), even though he was talking to his friend, he didn't even face him. He probably thought I didn't notice as I was on my phone but I did. He continued looking - or rather, watching - me for a quite long time as he talked.
To be completely sure I wasn't imagining things, I looked at him in the eyes and that was like he was already looking at my face. As I looked at him, he stopped talking, his mouth slightly open (I don't know if he was going to say something), looking into my eyes.
Then I looked back at my phone but, he started to look at me again and, the moment I looked up (for the second time) he really quickly looks at something next to me.

Why did he act like that?
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Why? (except because of the fact I'm his crush)
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Do you know?
Why this guy stared at me while talking to his friend?
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