Actually i get why you think you love her, reason is that during sex in males a hormone is created that supposedly binds you to the partner you have sex with. and by "bind" i mean creates emotional attachment aka love. So stop having sex with her, go take her hotter friend out and have sex with her and u will love her friend as well and forget about the other girl lol.

of course this WILL make her jelaous and might make her beg you to return to her. Do not give in.

Good Game.