Is it OK to slap a guy who never called after ?

So he knew I liked him. Honestly, we didn't know each other that well but we shagged anyway. He told me he was in love, he wanted to date me, made some loose plans with me then never called me again. Also he came inside me and was maybe even trying to get me pregnant (which makes not calling even worse)! I sent him some text messages, no reponse. BTW, I'm not pregnant. I think I may see him at an upcoming event. Is it OK to slap him? Guys, how would you react if a girl slapped you (in a similar situation)???