LEO GUY & SCORPIO GIRL QUESTION----HELP!!!!!

I am a Scorpio gal that just started dating a Leo guy. I'm skittish, because I've heard that he is a player...although this comes from his EX of course. Okay, so he blows up my phone texting, saying the most sweetest things that have ever been said to me before. Hung out as friends a few times, and have texted for weeks, and talked on phone a few times too. Ask me out a few times, I turned him down. Finally said yes. He starts laying the dirty talk on me via text. I play back. But deep down, skittish and wondering if all he wants is a piece of action. Hang out, he starts laying on serious moves, I back up. Told him I am not ready for that, I want to get to know him first. He said he understood, but next day? Starts being withdrawn. No more sweet texts, but yet still texts me. Still hangs out with me everyday. But has withdrawn. HELP? I've asked him several times what's up and said I feel he's being withdrawn but he says he's tired, etc etc.....But then says he likes me a lot and still hangs with me, kisses me, etc. But all the sweet texts have stopped. What's going through his mind?? I've given him the option to back away if he's having second thoughts and he said no way, he's not. I'm just not ready for sex after only a week of dating, it's not me. I told him I would get there but it's too soon. Insight anyone?