if I loved you,I would have fallen in love with you这样是与过去事实相反的

不知道你想表达什么意思,love 和fall in love是一个意思,你的句子翻译成汉语了就是如果我喜欢了你,我就会喜欢过你了,

unlove这个说法太不地道了  你可以说if she hadn't loved you,后面就是what would you have done?