I am not engaged so I cant understand but I can imagine that once I do get engaged I would have no interest in other guys anymore. I know the taava does not go away but if the BF was just filling a void you now have someone else to fill that and its real, not just two teens playing around. hes yours for the rest of your life.
WIY- it lasted one day dont worry. it happens to be that I just googled the guy and saw lots of sick, nasty things about him online. I can only imagine what type of person he REALLY is! I thank Hashem that I never had anything else to do with such a sick person. And I daven that he find the right help and satisfaction in life.