I don’t get why he does this?

I notice this guy I like (He doesn’t know) would sometimes walk up to me like he wanted to say something, but doesn’t and walk away.

This happen on a few occasions where I’d be sitting down on my phone and in the corner of my eye he’ll approach me, I look up to acknowledge his presence and to see if he needs something, then he’ll just walk away.

And also this happened twice where I’m minding my business and he would chuckle, and when I asked whats funny, he’ll say “Nothing” and turn around still chuckling under his breath.

I would try talking to him and start up a convo, but I have social anxiety and what’s he does is kinda awkward so I don't know how to get him to talk to me without being weird
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I meant when I’m on my phone scrolling through social media or something he would sometimes come up, not when I’m talking on the phone. Just to clear that up
I don’t get why he does this?
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