Next time, don't tack on the "right now."
Because there may very likely be a next time. Or, of course, there may not.
HOWEVER, if there *is* a next time, then what's going on it that he's probing for how far he has to pursue before you say yes.
The blunter and more direct you get, the clearer the message that he won't ever get there. So if you need to be blunt, don't feel bad about it.
Feel free to say, "I'm not interested in pursuing a friendship with you."