Fourth date, no sex?

I had my fourth date with a guy I met yesterday. it was amazing, we talked for hours and couldn’t stop hugging and kissing. He even holds my hand in public. He was talking about meeting up again soon too.

Since it was our fourth date, I was expecting him to bring sex up but he didn’t. Previously he has bought it up. He asked me on the third date if I could stay over but I told him I couldn’t because of my parents.
We have been intimate before and I went to his place on our second date.

Why do guys who seemed really interested in sex before suddenly take things slow?
Fourth date, no sex?
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