What am I doing wrong?

Ok so I havent used this site in a while but I always like the answers I get. So here is the details of my question. So in the past couple months I have met a couple girls. The first one a couple months ago I met one night out on the town and got her number and she took mine as well. I called her the next day and after about a half hour of talking she asked me out for dinner for that same night. Of course I said yes and we went and had dinner, had great conversation and she couldn’t stop telling me all these things that were so great about me. I was thinking “Awesome!” I finally met a girl that was in to me. It was a really new feeling to me.

The second girl that I met everything was about the same way. She actually contacted me the day after we met and accepted a invitation to come and meet me for a couple drinks and to hang out.

Now both these girls I didn’t have sex with and only talked to for about a week. Through text and on te phone. I was not talking to them at the same time or anything like that. But all of a sudden one day after about a week they won’t answer calls or texts.

So I guess my question is what the **** am I doing wrong that makes these girls all of a sudden stop talking to me?