My boss keeps making sexual advances
he asked me if i would lick his lips
he helped me out when the store was busy and I couldnt do It all by myself. When I thanked him he asked me to thank him in his office, and winked.
He has also made quite a lot of comments about how he likes to have sex and that he would like to have sex with me. The thing is, i have no desire to, he actually repulses me.
His girlfriend will be there when he's making advances but she never hears him.
I dont want her to think im sleeping with him, because if we were the last two people on earth and human existence was up to me... i still wouldnt want to even see his c*ck, let alone touch it.
I cant quit, its a good job, and there is no way of getting a job as good as this one.
I don't know what sort of work you do, but this situation is bound to put a strain on other aspects of your life. You don't have a lot of choices here. You can continue to endure the present situation, which I don't think is going to do much for your self-esteem. You can tell him straight out that you aren't interested and risk the consequences. Or you can start looking for another suitable job while you continue to suffer his advances, and hope that something else comes up soon. Threatening to tell his girlfriend probably isn't an option because if she breaks up with him, it will either piss him off or make him more inclined to pursue you if he's free.
One way or another, if you tell him, you may very likely be risking your present employment. Only you know how much of his harassment you can safely take before psychological and/or physical stress begins to take its toll on you.
By the way, he sounds really gross.