Guy wants a sex holiday?

We met 2 weeks ago and started texting. We had sex few times as well when he would come over to my house. He proposed going to a one week getaway together and we went. We had plenty of sex, fun and it was great.
However, after the holiday, he started coming less on whatsapp and when I asked him to be in a relationship , he said he's not ready to be in one and started leaving me on read.

Now he ghosted me completely

Why did he do this and why go on holiday with me if he didn't want anything?
Guy wants a sex holiday?
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