" Dating " with this girl... Why She keeps distance All the time?

I am dating couple off months with one girl.
I asked her out when she pass by my work , cause she was gorgeous. She got me by her smile. And lucky , she said yes. But after some dates she still keeps distance , and it making me total Mad , anxious , sad... I don't know what more to do , to her close. She is realy complicated , and I need do some effort to have fun together in " dates " . ... What to do , to get her more close?
" Dating " with this girl... Why She keeps distance All the time?
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