When you really can't say anything because whatever you say is going to end badly!!

Where do I begin? I needed to get this off my chest because as I was talking to one of my closest friends today I thought I was going to have a heart attack. She is in a new relationship with a guy who is not good for her, he lies and not to mention is just not emotionally available to her. But yet none of this matters she is in love with him and is going to follow her heart... What do I do? I have said plenty of things to her to tell her that I think she is making a mistake and need to step back and worry about her and not him or his life. I feel like I am going to have to step back and stop worrying so much about her and let her to do this on her own and hope for the best for her but it's hard because there are so many RED flags with this guy!!!! I really don't get why some Women feel like they are here to serve men or they are beneath them it really drive me insane I feel like we as women should stand up for ourselves and for one another!!!! It's funny because my boyfriend of 7 years knows that if I feel strongly about something he isn't going to change my mind or opinion and we are OK being different. I think I was raised by such strong independent women that I got the best example of a woman being able to take care of herself!!!