be-truthful

I need some suggestions!! I have a best friend since 9 years now and we share our thoughts and secrets and likes and dislikes with each other. But since she has been going out with a guy for some a few months now she has stopped being the way she was with me. There are some kind of changes that i have seen in her. Just like a good friend should I discuss this with her? Or should i let it go and wait for the break up to happen coz I really don\’t think there\’s any future of them two!