It's something you have to put up with. Some girls want you to act all protective and jealous, others would rather laugh about it because they're with you and have no intention of getting with another guy. You need be wary of the girls who love the attention.
I don't have a girl but if I did I'd get jealous and respond in accordance to how long I've been in the relationship: A few months - step up and say something to make the guy leave her alone A few years - laugh it off.
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Yeah I usually do the same thing. I think it's fucking annoying when it does happen. Right in front of me.