How do I pursue this guy?

I hung out with this guy from high school twice, I didn't really know him back then but we just graduated college and he asked me to hangout. The first night he took me to a bar and we ended up hooking up... I didn't think it was that serious. We had a really good time so I asked him to hang out again a few nights later, we ended up going to a friend's party and then went home together. We had a really good time and I kinda caught some feelings. That was three days ago and he hasn't texted me or anything. I asked him to hangout yesterday around 8pm and he said "i'm chilling rn, another time tho".

I realized that he probably doesn't take me that seriously because our hang-outs have only been hook ups... how do i change this hook up into something more serious? Or is it not worth trying and he doesn't like me? How can i get him to actually like me?

How do I pursue this guy?
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