Am I handling this situation correctly?

Ok, so there is this girl that I have liked for a while, but I don't agree with the decisions she is making, so I don't know if I want to be part of her life anymore. We are pretty close friends, but she has promised me that in the future she can see us being together; she sincerely means this when she says this, it isn't just one of those nice ways to say no. Anyways, while I've been "waiting" she has been getting used by this guy for oral sex. After she gave him an ultimatum where she said that she would not give him oral sex if they weren't in a relationship, he of course asked her out. I know she is being used. Her friends know she is being used. Her mom knows she is being used. But only she herself can do anything about it, and she chooses not to. So they have been dating for a few months now, but I've been staying out of her way because I don't want to be involved with her. I would be lying if I said that I didn't like her anymore, but the things she is doing are against my morals; I can't condone her behavior. So, a few days ago she texted me for the first time in months, and I tried to make the message brief basically telling her that I don't want to be around her if she continues to do what she is doing, but now I feel like I hurt her. She is pretty sensitive and she has cried on my shoulder over the guy many times before, so I just know that the things I might have texted her could have made her cry too. Am I doing the right thing?