Unbiased opinions please

My friend Sarah has liked this guy John for like 9 years. Problem is, he's 4 years younger than her. This past summer, they have been hanging out a lot, and getting really friendly. He invited her over like every day, and they were constantly making...

out. They even had conversations about where and when they were going to have sex, and were always making sex jokes to each other.
About a week ago, they were at a mutual friend's house, and she finally gave in and gave him head. The next day he asked some other girl out. This girl is really nice and totally pretty, and Sarah doesnt want to hurt her, but some people have found out about what happened between them, and they have big mouths. Today she overheard people talking bout it openly, and was really upset with them. She denied it, and he would too if anyone confronted him, but she really likes him and is totally willing to wait until this relationship is over, but she is kinda' mad because he strung her along all summer.

(P.S. It was like the best night of her life, and he has a perfect penis.)

Now my questions.

Should she continue to lie about it, and pretend that it didnt happen?
What should she do about the people who are talking about it?
Does she have a right to be mad at him?
and.. Do you think he's worth waiting for?

If I were her I would keep telling people that it never happened, sounds like he is not worth her reputation. If someone asks or says something about it tell them its none of there business, worry about themselves. I don't blame her for being mad at him, he acted like he was all into her over the summer, (not trying to be harsh but its true) then he got what he wanted an doesnt want her anymore. I dont think he is worth waiting for, if he did like her (or even for sex) he would still be talking to her, he wouldn't be hooked up with another chic.

People are going to not like me after I share my somewhat biased yet insightful opinion. From my point of view, my 'advising' is partial to Sarah's best interests.
Sounds like your friend really got herself into a mess. I think this guy was probably using her. She should move on. (I should too, I think, but I can't bring myself to do it either. Probably talking about myself makes this opinion more biased, no?)
In answer to your questions; she doesn't have to tell the truth, at least not yet. This second question interests me. If I knew who it was, I would say the secret would be safe with me. Arn't you betraying Sarah by posting this question, not to be rude or anything...? She has every right to be mad at him! Sarah deserves better. He was wrong to use her. And lastly, if there's no one else interested in Sarah, why not wait? I think that's what Sarah would want to hear, even if he is scum (again, excuse the biased opinion.)

No, the guy is a total jerk and Sarah shouldn't waste her time waiting for him. If he really liked her, he would have started a relationship with her, instead of some other random girl.

She helped me write the question, so no im not betraying her.