to call or not to call? did sex too soon ruin it?

I'm sorry this is so long but i really need opinions plz!

I met this guy off a dating website, we emailed for about a day, texted and talked on the phone for about two weeks then we finally met. Our first date was on a Wednesday, he took me out to the movies and out to eat, he even introduced me to some of his friends that night. We hit it off so good that about an hour after he dropped me off he asked if he could see me the next day. I let him come over to my place (he lives accross the st believe it or not), we watched TV then we snuggled and the kissing got a little heavy and well we ended up having sex. I was hesitant but he seduced me (haha i know it's not funny but he did). So the sex was great, we snuggled some more he stayed over for about 5 hours and all we did was watch tv. The next day he came over again, he took me out to eat and we came back to my house. We gave each other a massage and again had sex. Sat he was out of town. Sunday when he came back he came to see me for a little while. We didn't do anything but kissed. He told me how beautiful I was and how much he missed me when he was gone. Monday we met up for maybe 30 minutes. We just hung out, made out a little and then all of a sudden he stopped texting. The next day he finally calls and doesn't say anything about ignoring my texts just asks if he can see me. So I gave him a little bit of a hard time about me being busy but I ended up saying yes. Well about 30 min. before we are supposed to meet he calls and says he has to cancel. I knew he had to go out of town early wed and he said he had a lot of things to do before he left, he truly sounded sincere about being sad he couldn't see me. Well Wednesday rolls around and NOTHING- not a text, not a call. And today nothing either. I sent him one text yesterday but all i said was "u must be busy".........It feels like everything was going so good...so much chemistry and BAM just like that he stopped calling. I know I went wrong with having sex with him.

what do you think has happened?

my game tells me to leave it alone...if he contacts me then good if not then oh well.