Serious girl problems?

ok so ive been talking to this girl from my school for the past few months. we've hooked up on multiple occions and really seemed to like each other. im a high proflleathlete at my school and i kinda get thrown in the stereotype of a pig however thats not the case at all im a nice kid just trying to find a nice girl. honestly shes my dream girl, however lately shes been kinda bipolar well have a day were we text all day and itll be great and there be other days were we text twice or so and itll be boring and rough. after those days i typically dont text first however around midnight shell try and spark convo and what not. whenever i say i miss her she never agrees or but dismisses it. she did have a bf that screwed her over in the past and i think shes afraid that she'll get emotionally hurt again but i would never do that. shes not the girl that would get with 100 guys a night at all, but she is really good looking and def gets hit on a million times a party idk what to do i care about her too much to let her go and everytime i try to tel her how i feel she kinda dismisses it. i dont think she realizes how much i care for her and want her to be happy and i know i can be that guy for her. what should i do?