Why do I? Should I keep.....?

First, think deeply about whether or not this guy really likes her for that one reason. Does he really show an interest in her? If he does, than just let things fall as they may.

But, if you truly think that is all he's after it's important that you tell your friend. That is what friends are for. Though they may not always want your opinion, it's best you give it to them but don't hold it against them like constantly reminding them and pressuring them to do as you believe.

Than, once that's in the way, tell her how you feel about her. And don't fear rejection. It's best you know she likes you or not and move on with your life rather than torturing yourself by seeing the girl you like go after some guy you don't trust to be good for her.

You can approach this two ways. By straight out telling her all this (which is quick and easier 'cos you'll be less nervous) OR you can work up to it by slowly spending more time with her and finding ways to be alone and when the time comes and the two of you have privacy (dinner or something where it's quiet) tell her.

She will respect your honesty. Are you just trying to get one thing out of her? If not then you should value her friendship and tell her what is really going on. She will probably go for you anyway for being the better guy. Kids change their mind in a flash and i am sure you guys are no different. She is probably getting your advice because she wants to talk to you and spend time with you. Do the right thing and tell her the truth about the guy she likes. She is going to have to deal with this her whole life so this will be a good lesson for her and you.

Tell her how you feel about the guy. If she is a friend she will respect your feelings. She might get a bit frustrated that you're keeping her from what she wants but that's okay. If she keeps going after the guy she might see what you see in the guy. If and when this happens tell her how you feel about her. Don't be afraid of being rejected you can still be friends. Do what you feel best when choosing what to do. Good Luck!

If you think he will only end up hurting her, you should tell her. After all, you're first and foremost her friend. In time, you should also gather your strenght and tell her how you feel about her. Probably she's not aware of your feelings for her, but she would gladly accept you as her boyfriend, cause she knows & trusts you. You never know until you try.

Good luck!

If you are a real friend then you wouldn't let her be use like that and if you have feeling for her step up and be a man and tell her but I wouldn't do both at the sametime because the she will thing you're only doing it because you want her.

Do what's best for her and tell her what you think the guy is after and that you like her.

What you should do is tell her that you like her. Because she may like you to that's way she is always asking for you advice.