Why do guys pull away?

I started seeing this guy and after our first date he doesn’t text me as much anymore. He will still text me everyday but it’ll just be one text or sometimes we’ll have a small conversation or sometimes he will call me to talk. But our conversation doesn’t feel like before our first date. Before he would be really into the conversation and ask me a bunch of questions and try to picture how our future would be like and now he just seems distant.
Why do guys pull away?
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