Do guys tend to get jealous when their crush talks to other guys?

Anonymous
If a guy has a crush on a girl, is it likely he will get jealous if she just talks to other guys I front of him?

I know a friend of mine has feelings for me. Among other really obvious signs, he seems to get weird or possibly jealous if I talk to any other guy in front of him.

If a guy compliments me in front of him, he will literally just stare him down and not say anything. Like if a guy who is my friend just tells me I'm pretty he will just stare at my friend.

I was talking to a guy online and smiling a lot and he said something about noticing I was excited and he then asked if I was talking to this other guy. I said I was and he was like "oh, ok" and got a little weird.

Little things like that. I have just noticed that he observes my interactions with other guys more than anyone else would.

And I'm not a flirty girl! I'm quite shy. I don't even know what flirting is honestly.

Is it common for a guy to get kind of "possessive" of his crush like that?
Do guys tend to get jealous when their crush talks to other guys?
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