Why would this guy who is mad at me turn his head around at a party to look at me with a pretty intense stare?

It was like he was trying to catch me looking at him. We have in the past kissed but he only wants to associate with me in groups now since I made him angry (he has issues with anger in general). Sometimes he flirts with other girls and then looks at me intensely. He does not want to date me. We didn’t speak to each other at the party and broadly avoided each other but it was like he was trying to get my attention. He literally turned his whole body and was watching where I was as I was talking to another person.
Why would this guy who is mad at me turn his head around at a party to look at me with a pretty intense stare?
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