Best friend problems

Nniki • Just a nobody trying to put God first JW
My friend I love her. But she's been acting like reckless. She's keeps waiting for these guys to take care of her. She sleeping around and when I confronted her about it she told me was that of my business. I said if you're going to be my life it is my business. I told him straight up how I felt that she's been acting like a slut. Notice I use the word acting because I don't believe this is who she's turning into. Just a phase in her life. I can't sit back she's doing. Because I don't think it's safe. I don't care how much protection she uses there's always a chance of getting pregnant. And I don't want that to happen to her being pregnant by some random. Or catching an STD. She's about to be 19 years old living with two friends. But just because you're on your own doesn't mean you should make bad decisions. Has anybody had a problem like this with a friend?? What can I tell her???