My GF put on weight and now I'm not attracted...is this wrong or normal or what?

yeah it's kind of wrong. I don't mean to sound critical but don't you like her as a person as well? this should make a difference. and weight doesn't last, she could lose it, put it back on again etc.. but she'll always be the same person personality wise. With a really good relationship you need to be attracted to the person as a person as well b/c attractiveness fades.