need ideas please

hello everyone,
this is my first time on this forum and i only came to seek your advise.
i met a girl few months ago and at that time she was with another man and now they are separated.
i like her very much and we already went out few times together and it was really nice.
the problem is that i live in another city so we do not see each other that much and when i talked to her about my feelings she said she need time because for now she consider me just as a friend specially after her previous experience.
i noticed that sometime she doesn't answer my calls for one day or 2 and then she become normal again.
i need advices because i'm not a patient guy and i can't stop thinking of her all the time.
i want to know what to do because i'm out of ideas and i don't want to stay a long time and at the end be rejected.
can you adice?