J.L.
How long have you guys been hanging out again? If it hasn't been that long you need to be patient. You're probably just excited and have that feeling of "rightness" (if thats a word). In other words everything fits for you, and for him, even with similar feelings, it's probably really scary.
Basically he is dating you but without saying the words because he can pull away whenever he wants when he gets scared. Sounds pretty normal, he will take the leap when he feels he is ready.
The fact that he has let you back in his life, has loved you all this time, and has let you into his kid's life says a lot! I would just enjoy things the way they are right now, and be patient.