It totally makes sense that you felt sick just because you were trying to force yourself to be into someone who you really are not. It's just your body's way of saying no. IMHO.
The girl a guy wants a relationship with and the girl a guy wants to have sex with should be different people Maggie. Its because we don't want men to only want relationships because they want to have sex with the woman they are in a relationship with. We want them to have relationships because they like the personality of the girl they want to be with, and we need them to be able to have sex with women they don't like so that cauliflower doesn't rule the earth instead of humans. That being said, I'm not having sex with a girl I don't like, but I'd like to. I'm not getting into a relationship with a girl I want to have sex with but don't like as a person. You called human nature sick. Its a good thing that men (some men, some wise men) choose their relationships based on personality instead of sexual attraction. Its also a necessary thing that men are like on/off switches, because without that, humans wouldn't procreate enough to survive.