How fast is too fast?

Ok, so I’ve been talking to this guy for like 3 days, yes that’s day and we started dating the day AFTER we met each other in person. I realize this is PROBABLY stupid in your opinion but whatever. I just got out of a 2 yr relationship with a real pain let me tell you. So I’ve been extremely happy being single, not worrying about finding a guy letting them come to me. Well, I met this guy on a social site.com and they have this blind date thing with a compatitbility test. Well, I seen his picture and thought, he’s reallly cute so I clicked on him and what not and we started talking. And then like the next day we met up for like 20 mins to see each other and then a couple days after we went on our first date together, and he asked me out and I said yes. The thing is, I can’t STOP thinking about him, anytime I’m with him I can’t STOP looking at him, I get upset when I can’t talk to him but not like overly upset. Just that kind of empty feeling. I’ve NEVER felt this way about a guy. I don’t know like if I’m moving to fast or what, but yeah we have messed around 3 base on him… and I know that makes me sound like a whore but it feels right. I’m not sure how to explain it. I just need some advice and none of my friends will help…