What does she mean when She says I'm distant?

Anonymous
So I've been talkin to this girl for the last 3 months, I've know her for a few years now, recently I moved a way for college though so I don't see her. the first two months we talked morning to night daily now, She tells me she misses me one day and then the next day hardly talks to me, then the next day i'll go all day without a word to her and she texts me at night sayin she needs me emotionally and physically, so I talk to her and then the next day we don't talk at all really, a few words here and there. One week she brought up when we dated a few years ago she told me I was the only guy she has ever been head over heels for, and she would bring up memories of us and she told me she still wears the ring I gave her, and so for the whole week we talked a lot and then the next week she would tell me she missed me and that my chances of dating her when I come back are really good and that when I come back I've got a date with her, but then then the next few days she hardly says a word to me, even when I try to talk to her. She told me I've changed in the last few years, she said i'm sweeter and what not which she liked. But yesterday she told me I've changed in the last week, saying that I've been distant? I don't understand this, i'm kinda confused so what do y'all think?
What does she mean when She says I'm distant?
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