I suppose Cradle has cleared our doubts...
Well, with regard to ur prob, I think it's just that the girl is
still unable to feel tied down yet. She maybe 21, but it doesn't
mean that she will understand the meaning of love, or being in a
relationship. U can say that she's matured, but it's a different
aspect of a person u r talking about here. Maybe she is
inexperience in handling relationship, or maybe experience
something about love in her life?
she could be bothered by something that u said, which u might say
without knowing. Maybe instead of calling her, can try writing to
her and tell her ur feelings and how u see the relationship, and
ask her for her views, reasons and stuff. It's a bit old-fashion,
but it works for some cases.
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Barely Bearing Berry Belly Bear