How should a girl respond?

So I hooked up with guy after a few drinks who was my friend then he left after flirting all night. We didn’t talk till like four days later. He is dating someone so we need to be careful but when we last talked he said he would be down to do it more. I texted him but he was out and didn’t respond but also have not talked in almost a week. Is this normal or is he no longer interested?

How should a girl respond?
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