What should i do? need advice?

ok so me and my best friend are really close but it seem like we are slowly fading from each other. i know why its because my friend got her first girlfriend like a week or 2 ago. i'm happy for her and all but she's always hanging out with her girlfriend and she always talking about her and everytime i'm with her she's texting her girlfriend. i mean i totally understands she likes this girl and everything but i just don't get it because i never did that to her when i had a boyfriend. then my second thing is she's going out with this girl but still hasn't broken up with her boyfriend! i mean she only had a boyfriend because she like his companionship but now she doesn't have the guts to dump him! it's getting really bad because she ignores his texts and him ALL the time and she's already had with her girlfriend! idk what to tell her without sounding like a totally *****. so what should i tell her? what should i do when it comes to these problems? btw her boyfrined is a friend of mine and her boyfriends best friend is the guy i like. so im scared if i say anything it might mess up something else. thank you!