So me and a guy that I went to high school were casually talking and ended up meeting up and hooking up but

I wanted it to be more but he ended up just not respond and we haven’t said anything to each other since. I can’t stop thinking about him and want to have sex with him again. He is a year younger than me and we are very attracted to each other but I don’t know how to reach out without looking desperate. Any advice or what to do to get the ball in my court?