<human>: Could you distill the essence of the text into 1-3 sentences?

A close friend of my gf has just basically told me she thinks another guy would suit my gf better than I do. This guy has already had a try at my gf (when we didn't know each other yet) but she refused him. I'm not affraid of losing my gf at all, I'm just not sure how to deal with her friend who wants her to give up on me and get together with the other guy.

I haven't told my gf about our conversation yet and she also doesn't know her friend thinks it would be better if she was with the other guy. 
How do I deal with her friend and should I try to be careful to not damage their friendship scince they have been close friends for about 5 years now?
<bot>: Friend of gf likes to see gf with somone else, how do I deal with this and should I try to not damage their friendship?