How do i get her back???

i am talkin to this girl that i really love. we are not together just talkin. long story short, i went to this party a day before i went up to visit her. there was a girl at the party that was into me and that i knew. we talked thats it but as she was leaving i gave her a hug goodbye and she put her lipz on my neck and tried to give me a hickey. i pulled away quick but she left a light mark. wen i visited my love she didnt even notice it till the next day. she said that i hurt her feelings and that i messed things up, that its over. she kicked me out and i called her constantly telling her i love her and i should of told her about that and that i dont wanna lose her. she tells me the same thing an says theres no hope and to not call her. but everytime i call her she answers her phone even after she told me what she had to tell me. what do i do, keep callin her or let her cool off? i dont wanna give up on her but how would i know if theres any hope? right now shes not even hearing what