<human>: I have no problem with her having guy friends. But I notice when she talks to them or texts them, she tends to talk more flirty and they tend to respond just as flirty. I know she likes attentions, as does any girl. 

This is the first real serious relationship we have both been in, so she has been flirty pretty much her whole life and she doesn't know how to just be friendly with people. This is a quote from her, "i don't know where the line is between friendly and flirty". 

Has anyone ever been in this scenario? She is completely willing to try and change the way she talks to them because I told her it makes me a little uncomfortable the way she talks to them.

Can you summarize the given text in a few sentences?
<bot>: fiance doesn't know the line between being friendly and being flirty when it comes to talking to her other guy friends. Where exactly is that line, and how can she stop the habit?