If he blew you off for no reason, then I'd tell him that you were no longer interested in him.
Now, if he had reason to get away from you, like your being too needy then maybe he wants to see if you have matured.
So, if it as just him vanishing for no reason, no 2nd chance for him. Even if the sex is amazing, still no 2nd chance. If you went a bit psycho on him and he is coming back, then maybe.