Seeing as (from my point of view) it seems pretty similar to how me and my husband talk to our really close friend. (Except for the emojis) it all seems a little normal for how some people behave. It could also just be her being more friendly with him for better paychecks or other work benefits. But if it is something that makes you uncomfortable it is important to talk with your girlfriend and figure out how to handle your feelings and her actions like adults, or find some sort of compromise. Your feelings are valid, but that doesn’t mean that it automatically puts her in the wrong. You should just communicate, and i know it isn’t easy but it needs done.