Heartbreak or Happiness?

I don't know what to think. My fav online guy of all time is back in my life sort of. He is emailing me again and says he is moving back. Our chemistry was the best--which is unusual for me. Sparks were flying. He is smart, cute, accomplished. Everything I like. Except dependable and uninterested, apparently, in a real relationship with me. But is he just older and wiser? Does he realize that I am his prize? That would be nice. I am afraid to give my heart to him again. But he does make me feel good. Can I make it into more of a friendship with him? Life is hard sometimes.