Girls, what is happening here?

My last five dates have ended the same way. Average girls, the only thing in common, different ages (from 24 to 38). At the beginning all this girls wanted to go out with me, some friends in common told me that her was crazy for me or they got nervous in my presence. Well it seemed easy. The dates were perfect, closing restaurants, in some cases sex. In all the cases she wanted to repeat, and told her friends that the date was perfect. Again, at this point, any problem. All seemed perfect.
But the problem is, after one or two dates no more dates arrived. Something happened to her or in her mind or something. In 4 of the 5 cases with time the proposed me another date. So, why is this radical change? I liked the girls, the dates were perfect, so what is the problem? Me?
Girls, what is happening here?
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