I feel like my girlfriend doesnt care about me?

i feel like she doesnt even think about me throughout the day i always have to call her she never calls me and usually when i do get her on the phone im the only one talking, we are in different towns right now so the only way we talk is on the phone shes not coming back to town for another few weeks, i feel like she ignores me she'll be on the phone with me and have to go do something and tell me she'll call me right back and hangs up but an hour later she hasnt called me back so i i call her back and shes not doing anything, what should i do about this