How can I get her back?

hi sir, i am loving my classmate. We used to talk through phone.we became good friends.one day she came to know that i am loving her and stopped talking to me.that day i called her and i asked her the reason for not talking.she said everyone is asking her that we both are having a affair.i said her i don’t have any opinion of love on her.i just want to concentrate on studies.from next day she was talking but she was not free as before.she stopped calling me.(she also said to one of my friends she came to know that i am having feelings on her.) so i started calling her twice a week.but i got frustrated one day and i asked her the reason for not being that much close as before.she was faking things that i am not calling anyone .and i asked her that u were lying and u called Udai (my friend) two days back.she said yes but i stopped calling because of her problems in home.so after this conversation i called her back again and i said sorry to her for talking like that.i called the next day but she was cutting the phone.now even today on the college she turned her back when i was passing her. So what should i do to get her back?