easy to change just tell your girlfriend you saw her friend yesterday and she's looking pretty good and if you weren't with your girlfriend you would probably ask her out. just make little comments like that every once in a while. women are so catty that friend will be history in no time.
If they are actual friends the girl should be worried about the guy being highly inappropriate. If you think that's how all female friendships work then you have met the wrong kind of women.
sorry guys i guess you have never experienced this. if a woman isn't catty and willing to fight for you maybe your doing it wrong. or maybe i'm just that good and worth fighting over.
It's not worth it to fight over a guy if he is the one making comments about your friend. Now if you see a "friend" making moves on your man that's a different story.
does this go on reddit or is this a troll