Why does he get so jealous?

There’s this one guy that I hardly ever interact with. He used to have a crush on me a LONG ASS time ago, but nothing ever happened. I sorta rejected him, but he’s had a couple things with other girls since then. But throughout all this time, he’s gotten jealous whenever I talk to/date/hook up with other guys. I asked people about this and they all said “that’s weird.” He doesn’t act this way with other girls. But I hardly interact with him at all! I still feel his tension/his stares/the way he acts when I'm with other guys. I am just confused. Why does he act so jealous? we don’t even talk...
Why does he get so jealous?
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