Basically, setup meet ups that are away from a se location. Coffee shop. Mall. Something public is easy. Show that yes you are up for hooking up, but it's not 'just" hooking up. During that time you can get to know each other more. And you can find out if you even like him. You might find out you don't and the idea of hooking up or continuing to hookup will no longer be appealing
By getting asking him out and getting to know him and not play games with him.
A little more explanation about getting to know him. A lot of guys will instantly want sex. Even the guy that is serious about you.
A mistake girls will make is immediately distance themselves from guys who want sex. Just don't have sex with them just give it time to get to know him and give him time to get to know you. Maybe he changes his mind and maybe he won't.