What does he want? He looks at me on and off but never talks to me?

There's a guy who always try to be in my vicinity. He is introvert. I caught him looking at me often but not always. I also noticed when I'm talking selfies or pics, he tries to look into my phone. He talked to me once but then I got into a fight with his female friends and after that he didn't talk to me but does the same (looking and noticing). When I'm with a bunch of girls, he acts normal but when I'm alone (as in waiting for my friend to show up), he starts looking at me. His bestie smiles or kind of laugh at him when I'm passing by. What does he want? His signals are inversely proportional to the amount of people around.

PS: We are in uni and not teenagers

What does he want? He looks at me on and off but never talks to me?
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