Girlfriend likes the jealous type and I'm jealous right now but still worried it might turn her off?

Anonymous
It's a tale as old as time, new relationship (1 month) she's got all kinds of friends but there's one guy who she hangs with 1 on 1 and I'm not happy about it.
I trust her. And we have such a good thing that it would make no sense for her to search for something else.
But now she's hanging out at his place on a Saturday night and I just wanna rip him apart.
Mainly because I wanna spend time with her but if I say anything I might be the controlling boyfriend asking his girl to alter her plans to accommodate him.

So now I gotta sit idly by as she spends an evening with a guy at his place just to show I'm the bigger man.

And today some stranger bought her and her colleagues lunch and I told her how I don't like a stranger buying my girlfriend lunch and that turned her on.

So I'm torn, do I tell her I don't want her hanging with some dude on Saturday or do I say nothing?
Girlfriend likes the jealous type and I'm jealous right now but still worried it might turn her off?
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