What does it mean if a guy introduces himself to you but has not talk to you?

Anonymous
So a few weeks ago, a guy came up to me and introduced himself to me. He shook my hand and we exchanged names and made small talk. He didn't ask for my number but he seemed kind of shy. I figured next time I see him, I will wave at him.

However, once my friend and I were walking to class, he walked right past me without acknowledging me.

I always see him staring at me on campus though but he hasn't come to talk to me. And now, every time we walk past each other, it's awkward because we just ignore each other's presence.

Is he waiting for me to make the next move? Or is he not interested anymore? I am not really good at this but I think I do like him but I just don't know what to make out of this.
What does it mean if a guy introduces himself to you but has not talk to you?
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