setting boundaries

I want to set boundaries on this guy I'm going out with because I'm not sure of his motives . I want to tell him I want to see him 3 more times before we have sex.. but I'm freaking out because that might push him away (but like that is a good thing since I'll find out what he really wants ).. what do you guys think?

ps we've had sex before.. but we took a hiatus and dated other people