The Only Girl I've ever genuinely cared about is with a total loser,what should I do?

Well try to go up to her and ask if you weren't going out with your boyfriend who would you go out with

You can't do anything, unless she is willing to hear your opinion about the matter... And I think she sees you just as a friend, otherwise she wouldn't be with the "bad boy"... Sorry.

Well first definitely don't tell her that her boyfriend is a loser maybe say he's not right for you. Whatever you do don't let him talk her into quiting school. He doesn't have her best interest in mind if he wants her to do that. Just kind of gradually try and move in. Make her realize that he just wants her for sex. If she tells you that stuff just kind of joking say stop giving it to him and see is he wants to stay. Don't necessarily break them up cause she may not be able to forgive you if he hurts her or she is hurt over it. but just act like a good friend like you are doing it doesn't sound like its going to be too long of a relationship usually women are pretty smart about those things and she will realize the right guy for her.

Unfortunately, she may have to learn a hard lesson while having this guy in her life. He does sound like a loser who definitely doesn't have her best interests at heart. I've always been amazed at how some girls get wrapped up in the "bad-boy" personality thing. It just seems so self-defeating and destructive to go in that direction. As I said though, she may have to learn the hard way on this one!

It sounds like she values you as a friend, but don't get your hopes up for any more while this guy is in the picture. Just be her friend for now! And tell her to stay in school!

I would take him aside, and calmly ask him in a non-accusatory way what he's doing with his life. In all likelihood, he'll give answers that show no plan for the future. He might even realize that he's not getting anywhere, and probably won't anytime soon. As a result, he could change his ways! Or not. The safest thing to do would be to have a hidden tape recorder and record the whole thing, with which you could even prove to the girl that her boyfriend is a lazy f***, even if you don't manage to prove that he only wants her for sex. Just my two cents. Everything else is good advice, too, which is why I didn't repeat it.

Say what? "Personally, I think her BF is using her for sex .....she is beautiful, but her mind is truly more important to me." Her mind is truly important to you, but yet she is being used for sex? No offense, but if she can't even see how pathetic her current bf is, maybe you need to date other women to fully understand what a strong minded woman is. From the descriptions you give, this girl is a weak minded individual---then again, I got high standards. :P
Since she confides in you a lot, have you asked her what is it that she wants in a relationship, or better yet, how is her current relationship enhancing her life and making her a better person?

Once you understand these, then maybe it will be easier to come up with something to make her see how her current relationship is not doing much....but honestly, if I were you, time to go out and date other type of women.