Just a Hook Up? Or More?

this guy and I hooked up a couple of times. The thing is that he was a first. so OBVIOUSLY I'm gonna have feelings. and now when I see him at work, my body gets hot and bothered. and all I wanna do is jump on him and make out. but I can't do that because we arent a thing. that and because he doesn't want anyone to know that we've hooked up. so you see my dilemma. we have NO way of communication at all. no snapchat. no phone number. nothing. (he's asked for my number three times but I didnt have a phone then). so now I am stuck with these feelios that I have. I HIGHLY doubt he has the same feelings. I keep telling myself that I am just another 'body count' to him. why? because I am an idiot. i know i should talk to him but... how? we're hook up buddies. not friends. and I am new to hooking with people. so... i dunno what to do.