Why do some girl don't give the shit/talk to the GUY who is ATTRACTED towards her ?

To be honest, there are many reasons.. But the main ones are either she may not be attracted to the guy who is attracted to her or the guy who is attracted to her is treating her too nicely. I know it sounds wired but it is true. I know because i am a girl and i have been there. There was this one guy who use to be so kind to me and treat me so good but i never wanted to be with him till he almost stopped caring. Most girls like to have to work for a guy she wants to be with. And its not like that all the time, like i said there can be many other reasons.