Guys do you not like it when your crush talks to other guys?

Anonymous
There has been a mutual liking between this guy and I. We’ve flirted and it’s fairly obvious we both like each other.

But I’ve realised sometimes when I’m talking to other guys very normally (not flirting or anything) at work he frowns and looks pretty off. One point he literally stood beside me but while talking to this guy but did not even make eye contact with me and he goes silent.

Another time I saw him looking at me talking to another colleague and he looked not happy but when I locked eyes with him he looked away and walked past me really rigid.

So like im not sure what the hell is happening, is it normal for guys to get unhappy when their crush (not even girlfriend) talks to other guys?
Guys do you not like it when your crush talks to other guys?
9 Opinion